1 /* $NetBSD: pfctl_osfp.c,v 1.5 2005/07/01 12:43:50 peter Exp $ */ 2 /* $OpenBSD: pfctl_osfp.c,v 1.12 2005/02/17 13:18:00 aaron Exp $ */ 3 4 /* 5 * Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 #include <sys/ioctl.h> 22 #include <sys/socket.h> 23 24 #ifdef __NetBSD__ 25 #include <netinet/in.h> 26 #endif 27 28 #include <net/if.h> 29 #include <net/pfvar.h> 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <errno.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 38 #include "pfctl_parser.h" 39 #include "pfctl.h" 40 41 #ifndef MIN 42 # define MIN(a,b) (((a) < (b)) ? (a) : (b)) 43 #endif /* MIN */ 44 #ifndef MAX 45 # define MAX(a,b) (((a) > (b)) ? (a) : (b)) 46 #endif /* MAX */ 47 48 49 #if 0 50 # define DEBUG(fp, str, v...) \ 51 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 52 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 53 #else 54 # define DEBUG(fp, str, v...) ((void)0) 55 #endif 56 57 58 struct name_entry; 59 LIST_HEAD(name_list, name_entry); 60 struct name_entry { 61 LIST_ENTRY(name_entry) nm_entry; 62 int nm_num; 63 char nm_name[PF_OSFP_LEN]; 64 65 struct name_list nm_sublist; 66 int nm_sublist_num; 67 }; 68 struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 69 int class_count; 70 int fingerprint_count; 71 72 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 73 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 74 void pfctl_flush_my_fingerprints(struct name_list *); 75 char *get_field(char **, size_t *, int *); 76 int get_int(char **, size_t *, int *, int *, const char *, 77 int, int, const char *, int); 78 int get_str(char **, size_t *, char **, const char *, int, 79 const char *, int); 80 int get_tcpopts(const char *, int, const char *, 81 pf_tcpopts_t *, int *, int *, int *, int *, int *, 82 int *); 83 void import_fingerprint(struct pf_osfp_ioctl *); 84 const char *print_ioctl(struct pf_osfp_ioctl *); 85 void print_name_list(int, struct name_list *, const char *); 86 void sort_name_list(int, struct name_list *); 87 struct name_entry *lookup_name_list(struct name_list *, const char *); 88 89 /* Load fingerprints from a file */ 90 int 91 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 92 { 93 FILE *in; 94 char *line; 95 size_t len; 96 int i, lineno = 0; 97 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 98 wscale_mod, optcnt, ts0; 99 pf_tcpopts_t packed_tcpopts; 100 char *class, *version, *subtype, *desc, *tcpopts; 101 struct pf_osfp_ioctl fp; 102 103 pfctl_flush_my_fingerprints(&classes); 104 105 if ((in = pfctl_fopen(fp_filename, "r")) == NULL) { 106 warn("%s", fp_filename); 107 return (1); 108 } 109 class = version = subtype = desc = tcpopts = NULL; 110 111 if ((opts & PF_OPT_NOACTION) == 0) 112 pfctl_clear_fingerprints(dev, opts); 113 114 while ((line = fgetln(in, &len)) != NULL) { 115 lineno++; 116 if (class) 117 free(class); 118 if (version) 119 free(version); 120 if (subtype) 121 free(subtype); 122 if (desc) 123 free(desc); 124 if (tcpopts) 125 free(tcpopts); 126 class = version = subtype = desc = tcpopts = NULL; 127 memset(&fp, 0, sizeof(fp)); 128 129 /* Chop off comment */ 130 for (i = 0; i < len; i++) 131 if (line[i] == '#') { 132 len = i; 133 break; 134 } 135 /* Chop off whitespace */ 136 while (len > 0 && isspace((unsigned char)line[len - 1])) 137 len--; 138 while (len > 0 && isspace((unsigned char)line[0])) { 139 len--; 140 line++; 141 } 142 if (len == 0) 143 continue; 144 145 #define T_DC 0x01 /* Allow don't care */ 146 #define T_MSS 0x02 /* Allow MSS multiple */ 147 #define T_MTU 0x04 /* Allow MTU multiple */ 148 #define T_MOD 0x08 /* Allow modulus */ 149 150 #define GET_INT(v, mod, n, ty, mx) \ 151 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) 152 #define GET_STR(v, n, mn) \ 153 get_str(&line, &len, &v, n, mn, fp_filename, lineno) 154 155 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| 156 T_MOD, 0xffff) || 157 GET_INT(ttl, NULL, "ttl", 0, 0xff) || 158 GET_INT(df, NULL, "don't fragment frag", 0, 1) || 159 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 160 8192) || 161 GET_STR(tcpopts, "TCP Options", 1) || 162 GET_STR(class, "OS class", 1) || 163 GET_STR(version, "OS version", 0) || 164 GET_STR(subtype, "OS subtype", 0) || 165 GET_STR(desc, "OS description", 2)) 166 continue; 167 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, 168 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) 169 continue; 170 if (len != 0) { 171 fprintf(stderr, "%s:%d excess field\n", fp_filename, 172 lineno); 173 continue; 174 } 175 176 fp.fp_ttl = ttl; 177 if (df) 178 fp.fp_flags |= PF_OSFP_DF; 179 switch (w_mod) { 180 case 0: 181 break; 182 case T_DC: 183 fp.fp_flags |= PF_OSFP_WSIZE_DC; 184 break; 185 case T_MSS: 186 fp.fp_flags |= PF_OSFP_WSIZE_MSS; 187 break; 188 case T_MTU: 189 fp.fp_flags |= PF_OSFP_WSIZE_MTU; 190 break; 191 case T_MOD: 192 fp.fp_flags |= PF_OSFP_WSIZE_MOD; 193 break; 194 } 195 fp.fp_wsize = window; 196 197 switch (p_mod) { 198 case T_DC: 199 fp.fp_flags |= PF_OSFP_PSIZE_DC; 200 break; 201 case T_MOD: 202 fp.fp_flags |= PF_OSFP_PSIZE_MOD; 203 } 204 fp.fp_psize = psize; 205 206 207 switch (wscale_mod) { 208 case T_DC: 209 fp.fp_flags |= PF_OSFP_WSCALE_DC; 210 break; 211 case T_MOD: 212 fp.fp_flags |= PF_OSFP_WSCALE_MOD; 213 } 214 fp.fp_wscale = wscale; 215 216 switch (mss_mod) { 217 case T_DC: 218 fp.fp_flags |= PF_OSFP_MSS_DC; 219 break; 220 case T_MOD: 221 fp.fp_flags |= PF_OSFP_MSS_MOD; 222 break; 223 } 224 fp.fp_mss = mss; 225 226 fp.fp_tcpopts = packed_tcpopts; 227 fp.fp_optcnt = optcnt; 228 if (ts0) 229 fp.fp_flags |= PF_OSFP_TS0; 230 231 if (class[0] == '@') 232 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; 233 if (class[0] == '*') 234 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; 235 236 if (class[0] == '@' || class[0] == '*') 237 strlcpy(fp.fp_os.fp_class_nm, class + 1, 238 sizeof(fp.fp_os.fp_class_nm)); 239 else 240 strlcpy(fp.fp_os.fp_class_nm, class, 241 sizeof(fp.fp_os.fp_class_nm)); 242 strlcpy(fp.fp_os.fp_version_nm, version, 243 sizeof(fp.fp_os.fp_version_nm)); 244 strlcpy(fp.fp_os.fp_subtype_nm, subtype, 245 sizeof(fp.fp_os.fp_subtype_nm)); 246 247 add_fingerprint(dev, opts, &fp); 248 } 249 250 if (class) 251 free(class); 252 if (version) 253 free(version); 254 if (subtype) 255 free(subtype); 256 if (desc) 257 free(desc); 258 259 fclose(in); 260 261 if (opts & PF_OPT_VERBOSE2) 262 printf("Loaded %d passive OS fingerprints\n", 263 fingerprint_count); 264 return (0); 265 } 266 267 /* flush the kernel's fingerprints */ 268 void 269 pfctl_clear_fingerprints(int dev, int opts) 270 { 271 if (ioctl(dev, DIOCOSFPFLUSH)) 272 err(1, "DIOCOSFPFLUSH"); 273 } 274 275 /* flush pfctl's view of the fingerprints */ 276 void 277 pfctl_flush_my_fingerprints(struct name_list *list) 278 { 279 struct name_entry *nm; 280 281 while ((nm = LIST_FIRST(list)) != NULL) { 282 LIST_REMOVE(nm, nm_entry); 283 pfctl_flush_my_fingerprints(&nm->nm_sublist); 284 free(nm); 285 } 286 fingerprint_count = 0; 287 class_count = 0; 288 } 289 290 /* Fetch the active fingerprints from the kernel */ 291 int 292 pfctl_load_fingerprints(int dev, int opts) 293 { 294 struct pf_osfp_ioctl io; 295 int i; 296 297 pfctl_flush_my_fingerprints(&classes); 298 299 for (i = 0; i >= 0; i++) { 300 memset(&io, 0, sizeof(io)); 301 io.fp_getnum = i; 302 if (ioctl(dev, DIOCOSFPGET, &io)) { 303 if (errno == EBUSY) 304 break; 305 warn("DIOCOSFPGET"); 306 return (1); 307 } 308 import_fingerprint(&io); 309 } 310 return (0); 311 } 312 313 /* List the fingerprints */ 314 void 315 pfctl_show_fingerprints(int opts) 316 { 317 if (LIST_FIRST(&classes) != NULL) { 318 if (opts & PF_OPT_SHOWALL) { 319 pfctl_print_title("OS FINGERPRINTS:"); 320 printf("%u fingerprints loaded\n", fingerprint_count); 321 } else { 322 printf("Class\tVersion\tSubtype(subversion)\n"); 323 printf("-----\t-------\t-------------------\n"); 324 sort_name_list(opts, &classes); 325 print_name_list(opts, &classes, ""); 326 } 327 } 328 } 329 330 /* Lookup a fingerprint */ 331 pf_osfp_t 332 pfctl_get_fingerprint(const char *name) 333 { 334 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 335 pf_osfp_t ret = PF_OSFP_NOMATCH; 336 int class, version, subtype; 337 int unp_class, unp_version, unp_subtype; 338 int wr_len, version_len, subtype_len; 339 char *ptr, *wr_name; 340 341 if (strcasecmp(name, "unknown") == 0) 342 return (PF_OSFP_UNKNOWN); 343 344 /* Try most likely no version and no subtype */ 345 if ((nm = lookup_name_list(&classes, name))) { 346 class = nm->nm_num; 347 version = PF_OSFP_ANY; 348 subtype = PF_OSFP_ANY; 349 goto found; 350 } else { 351 352 /* Chop it up into class/version/subtype */ 353 354 if ((wr_name = strdup(name)) == NULL) 355 err(1, "malloc"); 356 if ((ptr = strchr(wr_name, ' ')) == NULL) { 357 free(wr_name); 358 return (PF_OSFP_NOMATCH); 359 } 360 *ptr++ = '\0'; 361 362 /* The class is easy to find since it is delimited by a space */ 363 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 364 free(wr_name); 365 return (PF_OSFP_NOMATCH); 366 } 367 class = class_nm->nm_num; 368 369 /* Try no subtype */ 370 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 371 { 372 version = version_nm->nm_num; 373 subtype = PF_OSFP_ANY; 374 free(wr_name); 375 goto found; 376 } 377 378 379 /* 380 * There must be a version and a subtype. 381 * We'll do some fuzzy matching to pick up things like: 382 * Linux 2.2.14 (version=2.2 subtype=14) 383 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 384 * Windows 2000 SP2 (version=2000 subtype=SP2) 385 */ 386 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 387 wr_len = strlen(ptr); 388 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 389 version_len = strlen(version_nm->nm_name); 390 if (wr_len < version_len + 2 || 391 !CONNECTOR(ptr[version_len])) 392 continue; 393 /* first part of the string must be version */ 394 if (strncasecmp(ptr, version_nm->nm_name, 395 version_len)) 396 continue; 397 398 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 399 nm_entry) { 400 subtype_len = strlen(subtype_nm->nm_name); 401 if (wr_len != version_len + subtype_len + 1) 402 continue; 403 404 /* last part of the string must be subtype */ 405 if (strcasecmp(&ptr[version_len+1], 406 subtype_nm->nm_name) != 0) 407 continue; 408 409 /* Found it!! */ 410 version = version_nm->nm_num; 411 subtype = subtype_nm->nm_num; 412 free(wr_name); 413 goto found; 414 } 415 } 416 417 free(wr_name); 418 return (PF_OSFP_NOMATCH); 419 } 420 421 found: 422 PF_OSFP_PACK(ret, class, version, subtype); 423 if (ret != PF_OSFP_NOMATCH) { 424 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 425 if (class != unp_class) { 426 fprintf(stderr, "warning: fingerprint table overflowed " 427 "classes\n"); 428 return (PF_OSFP_NOMATCH); 429 } 430 if (version != unp_version) { 431 fprintf(stderr, "warning: fingerprint table overflowed " 432 "versions\n"); 433 return (PF_OSFP_NOMATCH); 434 } 435 if (subtype != unp_subtype) { 436 fprintf(stderr, "warning: fingerprint table overflowed " 437 "subtypes\n"); 438 return (PF_OSFP_NOMATCH); 439 } 440 } 441 if (ret == PF_OSFP_ANY) { 442 /* should never happen */ 443 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 444 return (PF_OSFP_NOMATCH); 445 } 446 447 return (ret); 448 } 449 450 /* Lookup a fingerprint name by ID */ 451 char * 452 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 453 { 454 int class, version, subtype; 455 struct name_list *list; 456 struct name_entry *nm; 457 458 char *class_name, *version_name, *subtype_name; 459 class_name = version_name = subtype_name = NULL; 460 461 if (fp == PF_OSFP_UNKNOWN) { 462 strlcpy(buf, "unknown", len); 463 return (buf); 464 } 465 if (fp == PF_OSFP_ANY) { 466 strlcpy(buf, "any", len); 467 return (buf); 468 } 469 470 PF_OSFP_UNPACK(fp, class, version, subtype); 471 if (class >= (1 << _FP_CLASS_BITS) || 472 version >= (1 << _FP_VERSION_BITS) || 473 subtype >= (1 << _FP_SUBTYPE_BITS)) { 474 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 475 strlcpy(buf, "nomatch", len); 476 return (buf); 477 } 478 479 LIST_FOREACH(nm, &classes, nm_entry) { 480 if (nm->nm_num == class) { 481 class_name = nm->nm_name; 482 if (version == PF_OSFP_ANY) 483 goto found; 484 list = &nm->nm_sublist; 485 LIST_FOREACH(nm, list, nm_entry) { 486 if (nm->nm_num == version) { 487 version_name = nm->nm_name; 488 if (subtype == PF_OSFP_ANY) 489 goto found; 490 list = &nm->nm_sublist; 491 LIST_FOREACH(nm, list, nm_entry) { 492 if (nm->nm_num == subtype) { 493 subtype_name = 494 nm->nm_name; 495 goto found; 496 } 497 } /* foreach subtype */ 498 strlcpy(buf, "nomatch", len); 499 return (buf); 500 } 501 } /* foreach version */ 502 strlcpy(buf, "nomatch", len); 503 return (buf); 504 } 505 } /* foreach class */ 506 507 strlcpy(buf, "nomatch", len); 508 return (buf); 509 510 found: 511 snprintf(buf, len, "%s", class_name); 512 if (version_name) { 513 strlcat(buf, " ", len); 514 strlcat(buf, version_name, len); 515 if (subtype_name) { 516 if (strchr(version_name, ' ')) 517 strlcat(buf, " ", len); 518 else if (strchr(version_name, '.') && 519 isdigit((unsigned char)*subtype_name)) 520 strlcat(buf, ".", len); 521 else 522 strlcat(buf, " ", len); 523 strlcat(buf, subtype_name, len); 524 } 525 } 526 return (buf); 527 } 528 529 /* lookup a name in a list */ 530 struct name_entry * 531 lookup_name_list(struct name_list *list, const char *name) 532 { 533 struct name_entry *nm; 534 LIST_FOREACH(nm, list, nm_entry) 535 if (strcasecmp(name, nm->nm_name) == 0) 536 return (nm); 537 538 return (NULL); 539 } 540 541 542 void 543 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 544 { 545 struct pf_osfp_ioctl fptmp; 546 struct name_entry *nm_class, *nm_version, *nm_subtype; 547 int class, version, subtype; 548 549 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 550 #define EXPAND(field) do { \ 551 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 552 /* pick major version out of #.# */ \ 553 if (isdigit((unsigned char)fp->field[_i]) && fp->field[_i+1] == '.') { \ 554 _dot = fp->field[_i] - '0'; \ 555 _i += 2; \ 556 } \ 557 if (isdigit((unsigned char)fp->field[_i])) \ 558 _start = fp->field[_i++] - '0'; \ 559 else \ 560 break; \ 561 if (isdigit((unsigned char)fp->field[_i])) \ 562 _start = (_start * 10) + fp->field[_i++] - '0'; \ 563 if (fp->field[_i++] != '-') \ 564 break; \ 565 if (isdigit((unsigned char)fp->field[_i]) && fp->field[_i+1] == '.' && \ 566 fp->field[_i] - '0' == _dot) \ 567 _i += 2; \ 568 else if (_dot != -1) \ 569 break; \ 570 if (isdigit((unsigned char)fp->field[_i])) \ 571 _end = fp->field[_i++] - '0'; \ 572 else \ 573 break; \ 574 if (isdigit((unsigned char)fp->field[_i])) \ 575 _end = (_end * 10) + fp->field[_i++] - '0'; \ 576 if (isdigit((unsigned char)fp->field[_i])) \ 577 _end = (_end * 10) + fp->field[_i++] - '0'; \ 578 if (fp->field[_i] != '\0') \ 579 break; \ 580 memcpy(&fptmp, fp, sizeof(fptmp)); \ 581 for (;_start <= _end; _start++) { \ 582 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 583 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 584 if (_dot == -1) \ 585 snprintf(fptmp.field, sizeof(fptmp.field), \ 586 "%d", _start); \ 587 else \ 588 snprintf(fptmp.field, sizeof(fptmp.field), \ 589 "%d.%d", _dot, _start); \ 590 add_fingerprint(dev, opts, &fptmp); \ 591 } \ 592 } while(0) 593 594 /* We allow "#-#" as a version or subtype and we'll expand it */ 595 EXPAND(fp_os.fp_version_nm); 596 EXPAND(fp_os.fp_subtype_nm); 597 598 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 599 errx(1, "fingerprint class \"nomatch\" is reserved"); 600 601 version = PF_OSFP_ANY; 602 subtype = PF_OSFP_ANY; 603 604 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 605 if (nm_class->nm_num == 0) 606 nm_class->nm_num = ++class_count; 607 class = nm_class->nm_num; 608 609 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 610 fp->fp_os.fp_version_nm); 611 if (nm_version) { 612 if (nm_version->nm_num == 0) 613 nm_version->nm_num = ++nm_class->nm_sublist_num; 614 version = nm_version->nm_num; 615 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 616 fp->fp_os.fp_subtype_nm); 617 if (nm_subtype) { 618 if (nm_subtype->nm_num == 0) 619 nm_subtype->nm_num = 620 ++nm_version->nm_sublist_num; 621 subtype = nm_subtype->nm_num; 622 } 623 } 624 625 626 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 627 print_ioctl(fp)); 628 629 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 630 fingerprint_count++; 631 632 #ifdef FAKE_PF_KERNEL 633 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 634 if ((errno = pf_osfp_add(fp))) 635 #else 636 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp)) 637 #endif /* FAKE_PF_KERNEL */ 638 { 639 if (errno == EEXIST) { 640 warn("Duplicate signature for %s %s %s", 641 fp->fp_os.fp_class_nm, 642 fp->fp_os.fp_version_nm, 643 fp->fp_os.fp_subtype_nm); 644 645 } else { 646 err(1, "DIOCOSFPADD"); 647 } 648 } 649 } 650 651 /* import a fingerprint from the kernel */ 652 void 653 import_fingerprint(struct pf_osfp_ioctl *fp) 654 { 655 struct name_entry *nm_class, *nm_version, *nm_subtype; 656 int class, version, subtype; 657 658 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 659 660 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 661 if (nm_class->nm_num == 0) { 662 nm_class->nm_num = class; 663 class_count = MAX(class_count, class); 664 } 665 666 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 667 fp->fp_os.fp_version_nm); 668 if (nm_version) { 669 if (nm_version->nm_num == 0) { 670 nm_version->nm_num = version; 671 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num, 672 version); 673 } 674 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 675 fp->fp_os.fp_subtype_nm); 676 if (nm_subtype) { 677 if (nm_subtype->nm_num == 0) { 678 nm_subtype->nm_num = subtype; 679 nm_version->nm_sublist_num = 680 MAX(nm_version->nm_sublist_num, subtype); 681 } 682 } 683 } 684 685 686 fingerprint_count++; 687 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 688 } 689 690 /* Find an entry for a fingerprints class/version/subtype */ 691 struct name_entry * 692 fingerprint_name_entry(struct name_list *list, char *name) 693 { 694 struct name_entry *nm_entry; 695 696 if (name == NULL || strlen(name) == 0) 697 return (NULL); 698 699 LIST_FOREACH(nm_entry, list, nm_entry) { 700 if (strcasecmp(nm_entry->nm_name, name) == 0) { 701 /* We'll move this to the front of the list later */ 702 LIST_REMOVE(nm_entry, nm_entry); 703 break; 704 } 705 } 706 if (nm_entry == NULL) { 707 nm_entry = calloc(1, sizeof(*nm_entry)); 708 if (nm_entry == NULL) 709 err(1, "calloc"); 710 LIST_INIT(&nm_entry->nm_sublist); 711 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 712 } 713 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 714 return (nm_entry); 715 } 716 717 718 void 719 print_name_list(int opts, struct name_list *nml, const char *prefix) 720 { 721 char newprefix[32]; 722 struct name_entry *nm; 723 724 LIST_FOREACH(nm, nml, nm_entry) { 725 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 726 nm->nm_name); 727 printf("%s\n", newprefix); 728 print_name_list(opts, &nm->nm_sublist, newprefix); 729 } 730 } 731 732 void 733 sort_name_list(int opts, struct name_list *nml) 734 { 735 struct name_list new; 736 struct name_entry *nm, *nmsearch, *nmlast; 737 738 /* yes yes, it's a very slow sort. so sue me */ 739 740 LIST_INIT(&new); 741 742 while ((nm = LIST_FIRST(nml)) != NULL) { 743 LIST_REMOVE(nm, nm_entry); 744 nmlast = NULL; 745 LIST_FOREACH(nmsearch, &new, nm_entry) { 746 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 747 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 748 break; 749 } 750 nmlast = nmsearch; 751 } 752 if (nmsearch == NULL) { 753 if (nmlast) 754 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 755 else 756 LIST_INSERT_HEAD(&new, nm, nm_entry); 757 } 758 759 sort_name_list(opts, &nm->nm_sublist); 760 } 761 nmlast = NULL; 762 while ((nm = LIST_FIRST(&new)) != NULL) { 763 LIST_REMOVE(nm, nm_entry); 764 if (nmlast == NULL) 765 LIST_INSERT_HEAD(nml, nm, nm_entry); 766 else 767 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 768 nmlast = nm; 769 } 770 return; 771 } 772 773 /* parse the next integer in a formatted config file line */ 774 int 775 get_int(char **line, size_t *len, int *var, int *mod, 776 const char *name, int flags, int max, const char *filename, int lineno) 777 { 778 int fieldlen, i; 779 char *field; 780 long val = 0; 781 782 if (mod) 783 *mod = 0; 784 *var = 0; 785 786 field = get_field(line, len, &fieldlen); 787 if (field == NULL) 788 return (1); 789 if (fieldlen == 0) { 790 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 791 return (1); 792 } 793 794 i = 0; 795 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 796 && fieldlen >= 1) { 797 switch (*field) { 798 case 'S': 799 if (mod && (flags & T_MSS)) 800 *mod = T_MSS; 801 if (fieldlen == 1) 802 return (0); 803 break; 804 case 'T': 805 if (mod && (flags & T_MTU)) 806 *mod = T_MTU; 807 if (fieldlen == 1) 808 return (0); 809 break; 810 case '*': 811 if (fieldlen != 1) { 812 fprintf(stderr, "%s:%d long '%c' %s\n", 813 filename, lineno, *field, name); 814 return (1); 815 } 816 if (mod && (flags & T_DC)) { 817 *mod = T_DC; 818 return (0); 819 } 820 case '%': 821 if (mod && (flags & T_MOD)) 822 *mod = T_MOD; 823 if (fieldlen == 1) { 824 fprintf(stderr, "%s:%d modulus %s must have a " 825 "value\n", filename, lineno, name); 826 return (1); 827 } 828 break; 829 } 830 if (mod == NULL || *mod == 0) { 831 fprintf(stderr, "%s:%d does not allow %c' %s\n", 832 filename, lineno, *field, name); 833 return (1); 834 } 835 i++; 836 } 837 838 for (; i < fieldlen; i++) { 839 if (field[i] < '0' || field[i] > '9') { 840 fprintf(stderr, "%s:%d non-digit character in %s\n", 841 filename, lineno, name); 842 return (1); 843 } 844 val = val * 10 + field[i] - '0'; 845 if (val < 0) { 846 fprintf(stderr, "%s:%d %s overflowed\n", filename, 847 lineno, name); 848 return (1); 849 } 850 } 851 852 if (val > max) { 853 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 854 name, val, max); 855 return (1); 856 } 857 *var = (int)val; 858 859 return (0); 860 } 861 862 /* parse the next string in a formatted config file line */ 863 int 864 get_str(char **line, size_t *len, char **v, const char *name, int minlen, 865 const char *filename, int lineno) 866 { 867 int fieldlen; 868 char *ptr; 869 870 ptr = get_field(line, len, &fieldlen); 871 if (ptr == NULL) 872 return (1); 873 if (fieldlen < minlen) { 874 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 875 return (1); 876 } 877 if ((*v = malloc(fieldlen + 1)) == NULL) { 878 perror("malloc()"); 879 return (1); 880 } 881 memcpy(*v, ptr, fieldlen); 882 (*v)[fieldlen] = '\0'; 883 884 return (0); 885 } 886 887 /* Parse out the TCP opts */ 888 int 889 get_tcpopts(const char *filename, int lineno, const char *tcpopts, 890 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 891 int *wscale_mod, int *ts0) 892 { 893 int i, opt; 894 895 *packed = 0; 896 *optcnt = 0; 897 *wscale = 0; 898 *wscale_mod = T_DC; 899 *mss = 0; 900 *mss_mod = T_DC; 901 *ts0 = 0; 902 if (strcmp(tcpopts, ".") == 0) 903 return (0); 904 905 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 906 switch ((opt = toupper((unsigned char)tcpopts[i++]))) { 907 case 'N': /* FALLTHROUGH */ 908 case 'S': 909 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 910 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 911 PF_OSFP_TCPOPT_SACK); 912 break; 913 case 'W': /* FALLTHROUGH */ 914 case 'M': { 915 int *this_mod, *this; 916 917 if (opt == 'W') { 918 this = wscale; 919 this_mod = wscale_mod; 920 } else { 921 this = mss; 922 this_mod = mss_mod; 923 } 924 *this = 0; 925 *this_mod = 0; 926 927 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 928 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 929 PF_OSFP_TCPOPT_MSS); 930 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 931 tcpopts[i + 1] == ',')) { 932 *this_mod = T_DC; 933 i++; 934 break; 935 } 936 937 if (tcpopts[i] == '%') { 938 *this_mod = T_MOD; 939 i++; 940 } 941 do { 942 if (!isdigit((unsigned char)tcpopts[i])) { 943 fprintf(stderr, "%s:%d unknown " 944 "character '%c' in %c TCP opt\n", 945 filename, lineno, tcpopts[i], opt); 946 return (1); 947 } 948 *this = (*this * 10) + tcpopts[i++] - '0'; 949 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 950 break; 951 } 952 case 'T': 953 if (tcpopts[i] == '0') { 954 *ts0 = 1; 955 i++; 956 } 957 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 958 PF_OSFP_TCPOPT_TS; 959 break; 960 } 961 (*optcnt) ++; 962 if (tcpopts[i] == '\0') 963 break; 964 if (tcpopts[i] != ',') { 965 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 966 filename, lineno, opt); 967 return (1); 968 } 969 i++; 970 } 971 972 return (0); 973 } 974 975 /* rip the next field ouf of a formatted config file line */ 976 char * 977 get_field(char **line, size_t *len, int *fieldlen) 978 { 979 char *ret, *ptr = *line; 980 size_t plen = *len; 981 982 983 while (plen && isspace((unsigned char)*ptr)) { 984 plen--; 985 ptr++; 986 } 987 ret = ptr; 988 *fieldlen = 0; 989 990 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 991 (*fieldlen)++; 992 if (plen) { 993 *line = ptr + 1; 994 *len = plen - 1; 995 } else { 996 *len = 0; 997 } 998 while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1])) 999 (*fieldlen)--; 1000 return (ret); 1001 } 1002 1003 1004 const char * 1005 print_ioctl(struct pf_osfp_ioctl *fp) 1006 { 1007 static char buf[1024]; 1008 char tmp[32]; 1009 int i, opt; 1010 1011 *buf = '\0'; 1012 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1013 strlcat(buf, "*", sizeof(buf)); 1014 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1015 strlcat(buf, "S", sizeof(buf)); 1016 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1017 strlcat(buf, "T", sizeof(buf)); 1018 else { 1019 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1020 strlcat(buf, "%", sizeof(buf)); 1021 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1022 strlcat(buf, tmp, sizeof(buf)); 1023 } 1024 strlcat(buf, ":", sizeof(buf)); 1025 1026 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1027 strlcat(buf, tmp, sizeof(buf)); 1028 strlcat(buf, ":", sizeof(buf)); 1029 1030 if (fp->fp_flags & PF_OSFP_DF) 1031 strlcat(buf, "1", sizeof(buf)); 1032 else 1033 strlcat(buf, "0", sizeof(buf)); 1034 strlcat(buf, ":", sizeof(buf)); 1035 1036 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1037 strlcat(buf, "*", sizeof(buf)); 1038 else { 1039 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1040 strlcat(buf, "%", sizeof(buf)); 1041 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1042 strlcat(buf, tmp, sizeof(buf)); 1043 } 1044 strlcat(buf, ":", sizeof(buf)); 1045 1046 if (fp->fp_optcnt == 0) 1047 strlcat(buf, ".", sizeof(buf)); 1048 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1049 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1050 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1051 switch (opt) { 1052 case PF_OSFP_TCPOPT_NOP: 1053 strlcat(buf, "N", sizeof(buf)); 1054 break; 1055 case PF_OSFP_TCPOPT_SACK: 1056 strlcat(buf, "S", sizeof(buf)); 1057 break; 1058 case PF_OSFP_TCPOPT_TS: 1059 strlcat(buf, "T", sizeof(buf)); 1060 if (fp->fp_flags & PF_OSFP_TS0) 1061 strlcat(buf, "0", sizeof(buf)); 1062 break; 1063 case PF_OSFP_TCPOPT_MSS: 1064 strlcat(buf, "M", sizeof(buf)); 1065 if (fp->fp_flags & PF_OSFP_MSS_DC) 1066 strlcat(buf, "*", sizeof(buf)); 1067 else { 1068 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1069 strlcat(buf, "%", sizeof(buf)); 1070 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1071 strlcat(buf, tmp, sizeof(buf)); 1072 } 1073 break; 1074 case PF_OSFP_TCPOPT_WSCALE: 1075 strlcat(buf, "W", sizeof(buf)); 1076 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1077 strlcat(buf, "*", sizeof(buf)); 1078 else { 1079 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1080 strlcat(buf, "%", sizeof(buf)); 1081 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1082 strlcat(buf, tmp, sizeof(buf)); 1083 } 1084 break; 1085 } 1086 1087 if (i != 0) 1088 strlcat(buf, ",", sizeof(buf)); 1089 } 1090 strlcat(buf, ":", sizeof(buf)); 1091 1092 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1093 strlcat(buf, ":", sizeof(buf)); 1094 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1095 strlcat(buf, ":", sizeof(buf)); 1096 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1097 strlcat(buf, ":", sizeof(buf)); 1098 1099 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1100 (long long int)fp->fp_tcpopts); 1101 strlcat(buf, tmp, sizeof(buf)); 1102 1103 return (buf); 1104 } 1105