1 /* $OpenBSD: pfctl_osfp.c,v 1.14 2006/04/08 02:13:14 ray Exp $ */ 2 3 /* 4 * Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #include <sys/types.h> 20 #include <sys/ioctl.h> 21 #include <sys/socket.h> 22 23 #include <net/if.h> 24 #include <net/pfvar.h> 25 26 #include <netinet/in_systm.h> 27 #include <netinet/ip.h> 28 #include <netinet/ip6.h> 29 30 #include <ctype.h> 31 #include <err.h> 32 #include <errno.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 37 #include "pfctl_parser.h" 38 #include "pfctl.h" 39 40 #ifndef MIN 41 # define MIN(a,b) (((a) < (b)) ? (a) : (b)) 42 #endif /* MIN */ 43 #ifndef MAX 44 # define MAX(a,b) (((a) > (b)) ? (a) : (b)) 45 #endif /* MAX */ 46 47 48 #if 0 49 # define DEBUG(fp, str, v...) \ 50 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 51 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 52 #else 53 # define DEBUG(fp, str, v...) ((void)0) 54 #endif 55 56 57 struct name_entry; 58 LIST_HEAD(name_list, name_entry); 59 struct name_entry { 60 LIST_ENTRY(name_entry) nm_entry; 61 int nm_num; 62 char nm_name[PF_OSFP_LEN]; 63 64 struct name_list nm_sublist; 65 int nm_sublist_num; 66 }; 67 static struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 68 static int class_count; 69 static int fingerprint_count; 70 71 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 72 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 73 void pfctl_flush_my_fingerprints(struct name_list *); 74 char *get_field(char **, size_t *, int *); 75 int get_int(char **, size_t *, int *, int *, const char *, 76 int, int, const char *, int); 77 int get_str(char **, size_t *, char **, const char *, int, 78 const char *, int); 79 int get_tcpopts(const char *, int, const char *, 80 pf_tcpopts_t *, int *, int *, int *, int *, int *, 81 int *); 82 void import_fingerprint(struct pf_osfp_ioctl *); 83 const char *print_ioctl(struct pf_osfp_ioctl *); 84 void print_name_list(int, struct name_list *, const char *); 85 void sort_name_list(int, struct name_list *); 86 struct name_entry *lookup_name_list(struct name_list *, const char *); 87 88 /* Load fingerprints from a file */ 89 int 90 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 91 { 92 FILE *in; 93 char *line; 94 size_t len; 95 int i, lineno = 0; 96 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 97 wscale_mod, optcnt, ts0; 98 pf_tcpopts_t packed_tcpopts; 99 char *class, *version, *subtype, *desc, *tcpopts; 100 struct pf_osfp_ioctl fp; 101 102 pfctl_flush_my_fingerprints(&classes); 103 104 if ((in = pfctl_fopen(fp_filename, "r")) == NULL) { 105 warn("%s", fp_filename); 106 return (1); 107 } 108 class = version = subtype = desc = tcpopts = NULL; 109 110 if ((opts & PF_OPT_NOACTION) == 0) 111 pfctl_clear_fingerprints(dev, opts); 112 113 while ((line = fgetln(in, &len)) != NULL) { 114 lineno++; 115 free(class); 116 free(version); 117 free(subtype); 118 free(desc); 119 free(tcpopts); 120 class = version = subtype = desc = tcpopts = NULL; 121 memset(&fp, 0, sizeof(fp)); 122 123 /* Chop off comment */ 124 for (i = 0; i < len; i++) 125 if (line[i] == '#') { 126 len = i; 127 break; 128 } 129 /* Chop off whitespace */ 130 while (len > 0 && isspace(line[len - 1])) 131 len--; 132 while (len > 0 && isspace(line[0])) { 133 len--; 134 line++; 135 } 136 if (len == 0) 137 continue; 138 139 #define T_DC 0x01 /* Allow don't care */ 140 #define T_MSS 0x02 /* Allow MSS multiple */ 141 #define T_MTU 0x04 /* Allow MTU multiple */ 142 #define T_MOD 0x08 /* Allow modulus */ 143 144 #define GET_INT(v, mod, n, ty, mx) \ 145 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) 146 #define GET_STR(v, n, mn) \ 147 get_str(&line, &len, &v, n, mn, fp_filename, lineno) 148 149 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| 150 T_MOD, 0xffff) || 151 GET_INT(ttl, NULL, "ttl", 0, 0xff) || 152 GET_INT(df, NULL, "don't fragment frag", 0, 1) || 153 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 154 8192) || 155 GET_STR(tcpopts, "TCP Options", 1) || 156 GET_STR(class, "OS class", 1) || 157 GET_STR(version, "OS version", 0) || 158 GET_STR(subtype, "OS subtype", 0) || 159 GET_STR(desc, "OS description", 2)) 160 continue; 161 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, 162 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) 163 continue; 164 if (len != 0) { 165 fprintf(stderr, "%s:%d excess field\n", fp_filename, 166 lineno); 167 continue; 168 } 169 170 fp.fp_ttl = ttl; 171 if (df) 172 fp.fp_flags |= PF_OSFP_DF; 173 switch (w_mod) { 174 case 0: 175 break; 176 case T_DC: 177 fp.fp_flags |= PF_OSFP_WSIZE_DC; 178 break; 179 case T_MSS: 180 fp.fp_flags |= PF_OSFP_WSIZE_MSS; 181 break; 182 case T_MTU: 183 fp.fp_flags |= PF_OSFP_WSIZE_MTU; 184 break; 185 case T_MOD: 186 fp.fp_flags |= PF_OSFP_WSIZE_MOD; 187 break; 188 } 189 fp.fp_wsize = window; 190 191 switch (p_mod) { 192 case T_DC: 193 fp.fp_flags |= PF_OSFP_PSIZE_DC; 194 break; 195 case T_MOD: 196 fp.fp_flags |= PF_OSFP_PSIZE_MOD; 197 } 198 fp.fp_psize = psize; 199 200 201 switch (wscale_mod) { 202 case T_DC: 203 fp.fp_flags |= PF_OSFP_WSCALE_DC; 204 break; 205 case T_MOD: 206 fp.fp_flags |= PF_OSFP_WSCALE_MOD; 207 } 208 fp.fp_wscale = wscale; 209 210 switch (mss_mod) { 211 case T_DC: 212 fp.fp_flags |= PF_OSFP_MSS_DC; 213 break; 214 case T_MOD: 215 fp.fp_flags |= PF_OSFP_MSS_MOD; 216 break; 217 } 218 fp.fp_mss = mss; 219 220 fp.fp_tcpopts = packed_tcpopts; 221 fp.fp_optcnt = optcnt; 222 if (ts0) 223 fp.fp_flags |= PF_OSFP_TS0; 224 225 if (class[0] == '@') 226 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; 227 if (class[0] == '*') 228 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; 229 230 if (class[0] == '@' || class[0] == '*') 231 strlcpy(fp.fp_os.fp_class_nm, class + 1, 232 sizeof(fp.fp_os.fp_class_nm)); 233 else 234 strlcpy(fp.fp_os.fp_class_nm, class, 235 sizeof(fp.fp_os.fp_class_nm)); 236 strlcpy(fp.fp_os.fp_version_nm, version, 237 sizeof(fp.fp_os.fp_version_nm)); 238 strlcpy(fp.fp_os.fp_subtype_nm, subtype, 239 sizeof(fp.fp_os.fp_subtype_nm)); 240 241 add_fingerprint(dev, opts, &fp); 242 243 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6); 244 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip); 245 add_fingerprint(dev, opts, &fp); 246 } 247 248 free(class); 249 free(version); 250 free(subtype); 251 free(desc); 252 free(tcpopts); 253 254 fclose(in); 255 256 if (opts & PF_OPT_VERBOSE2) 257 printf("Loaded %d passive OS fingerprints\n", 258 fingerprint_count); 259 return (0); 260 } 261 262 /* flush the kernel's fingerprints */ 263 void 264 pfctl_clear_fingerprints(int dev, int opts) 265 { 266 if (pfctl_flush_fingerprints(pfh) != 0) 267 pfctl_err(opts, 1, "DIOCOSFPFLUSH"); 268 } 269 270 /* flush pfctl's view of the fingerprints */ 271 void 272 pfctl_flush_my_fingerprints(struct name_list *list) 273 { 274 struct name_entry *nm; 275 276 while ((nm = LIST_FIRST(list)) != NULL) { 277 LIST_REMOVE(nm, nm_entry); 278 pfctl_flush_my_fingerprints(&nm->nm_sublist); 279 free(nm); 280 } 281 fingerprint_count = 0; 282 class_count = 0; 283 } 284 285 /* Fetch the active fingerprints from the kernel */ 286 int 287 pfctl_load_fingerprints(int dev, int opts) 288 { 289 struct pf_osfp_ioctl io; 290 int i; 291 292 pfctl_flush_my_fingerprints(&classes); 293 294 for (i = 0; i >= 0; i++) { 295 memset(&io, 0, sizeof(io)); 296 if ((errno = pfctl_get_fingerprint(pfh, i, &io)) != 0) { 297 if (errno == ENOENT) 298 break; 299 warn("DIOCOSFPGET"); 300 return (1); 301 } 302 import_fingerprint(&io); 303 } 304 return (0); 305 } 306 307 /* List the fingerprints */ 308 void 309 pfctl_show_fingerprints(int opts) 310 { 311 if (LIST_FIRST(&classes) != NULL) { 312 if (opts & PF_OPT_SHOWALL) { 313 pfctl_print_title("OS FINGERPRINTS:"); 314 printf("%u fingerprints loaded\n", fingerprint_count); 315 } else { 316 printf("Class\tVersion\tSubtype(subversion)\n"); 317 printf("-----\t-------\t-------------------\n"); 318 sort_name_list(opts, &classes); 319 print_name_list(opts, &classes, ""); 320 } 321 } 322 } 323 324 /* Lookup a fingerprint */ 325 pf_osfp_t 326 pfctl_find_fingerprint(const char *name) 327 { 328 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 329 pf_osfp_t ret = PF_OSFP_NOMATCH; 330 int class, version, subtype; 331 int unp_class, unp_version, unp_subtype; 332 int wr_len, version_len, subtype_len; 333 char *ptr, *wr_name; 334 335 if (strcasecmp(name, "unknown") == 0) 336 return (PF_OSFP_UNKNOWN); 337 338 /* Try most likely no version and no subtype */ 339 if ((nm = lookup_name_list(&classes, name))) { 340 class = nm->nm_num; 341 version = PF_OSFP_ANY; 342 subtype = PF_OSFP_ANY; 343 goto found; 344 } else { 345 346 /* Chop it up into class/version/subtype */ 347 348 if ((wr_name = strdup(name)) == NULL) 349 err(1, "malloc"); 350 if ((ptr = strchr(wr_name, ' ')) == NULL) { 351 free(wr_name); 352 return (PF_OSFP_NOMATCH); 353 } 354 *ptr++ = '\0'; 355 356 /* The class is easy to find since it is delimited by a space */ 357 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 358 free(wr_name); 359 return (PF_OSFP_NOMATCH); 360 } 361 class = class_nm->nm_num; 362 363 /* Try no subtype */ 364 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 365 { 366 version = version_nm->nm_num; 367 subtype = PF_OSFP_ANY; 368 free(wr_name); 369 goto found; 370 } 371 372 373 /* 374 * There must be a version and a subtype. 375 * We'll do some fuzzy matching to pick up things like: 376 * Linux 2.2.14 (version=2.2 subtype=14) 377 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 378 * Windows 2000 SP2 (version=2000 subtype=SP2) 379 */ 380 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 381 wr_len = strlen(ptr); 382 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 383 version_len = strlen(version_nm->nm_name); 384 if (wr_len < version_len + 2 || 385 !CONNECTOR(ptr[version_len])) 386 continue; 387 /* first part of the string must be version */ 388 if (strncasecmp(ptr, version_nm->nm_name, 389 version_len)) 390 continue; 391 392 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 393 nm_entry) { 394 subtype_len = strlen(subtype_nm->nm_name); 395 if (wr_len != version_len + subtype_len + 1) 396 continue; 397 398 /* last part of the string must be subtype */ 399 if (strcasecmp(&ptr[version_len+1], 400 subtype_nm->nm_name) != 0) 401 continue; 402 403 /* Found it!! */ 404 version = version_nm->nm_num; 405 subtype = subtype_nm->nm_num; 406 free(wr_name); 407 goto found; 408 } 409 } 410 411 free(wr_name); 412 return (PF_OSFP_NOMATCH); 413 } 414 415 found: 416 PF_OSFP_PACK(ret, class, version, subtype); 417 if (ret != PF_OSFP_NOMATCH) { 418 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 419 if (class != unp_class) { 420 fprintf(stderr, "warning: fingerprint table overflowed " 421 "classes\n"); 422 return (PF_OSFP_NOMATCH); 423 } 424 if (version != unp_version) { 425 fprintf(stderr, "warning: fingerprint table overflowed " 426 "versions\n"); 427 return (PF_OSFP_NOMATCH); 428 } 429 if (subtype != unp_subtype) { 430 fprintf(stderr, "warning: fingerprint table overflowed " 431 "subtypes\n"); 432 return (PF_OSFP_NOMATCH); 433 } 434 } 435 if (ret == PF_OSFP_ANY) { 436 /* should never happen */ 437 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 438 return (PF_OSFP_NOMATCH); 439 } 440 441 return (ret); 442 } 443 444 /* Lookup a fingerprint name by ID */ 445 char * 446 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 447 { 448 int class, version, subtype; 449 struct name_list *list; 450 struct name_entry *nm; 451 452 char *class_name, *version_name, *subtype_name; 453 class_name = version_name = subtype_name = NULL; 454 455 if (fp == PF_OSFP_UNKNOWN) { 456 strlcpy(buf, "unknown", len); 457 return (buf); 458 } 459 if (fp == PF_OSFP_ANY) { 460 strlcpy(buf, "any", len); 461 return (buf); 462 } 463 464 PF_OSFP_UNPACK(fp, class, version, subtype); 465 if (class >= (1 << _FP_CLASS_BITS) || 466 version >= (1 << _FP_VERSION_BITS) || 467 subtype >= (1 << _FP_SUBTYPE_BITS)) { 468 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 469 strlcpy(buf, "nomatch", len); 470 return (buf); 471 } 472 473 LIST_FOREACH(nm, &classes, nm_entry) { 474 if (nm->nm_num == class) { 475 class_name = nm->nm_name; 476 if (version == PF_OSFP_ANY) 477 goto found; 478 list = &nm->nm_sublist; 479 LIST_FOREACH(nm, list, nm_entry) { 480 if (nm->nm_num == version) { 481 version_name = nm->nm_name; 482 if (subtype == PF_OSFP_ANY) 483 goto found; 484 list = &nm->nm_sublist; 485 LIST_FOREACH(nm, list, nm_entry) { 486 if (nm->nm_num == subtype) { 487 subtype_name = 488 nm->nm_name; 489 goto found; 490 } 491 } /* foreach subtype */ 492 strlcpy(buf, "nomatch", len); 493 return (buf); 494 } 495 } /* foreach version */ 496 strlcpy(buf, "nomatch", len); 497 return (buf); 498 } 499 } /* foreach class */ 500 501 strlcpy(buf, "nomatch", len); 502 return (buf); 503 504 found: 505 snprintf(buf, len, "%s", class_name); 506 if (version_name) { 507 strlcat(buf, " ", len); 508 strlcat(buf, version_name, len); 509 if (subtype_name) { 510 if (strchr(version_name, ' ')) 511 strlcat(buf, " ", len); 512 else if (strchr(version_name, '.') && 513 isdigit(*subtype_name)) 514 strlcat(buf, ".", len); 515 else 516 strlcat(buf, " ", len); 517 strlcat(buf, subtype_name, len); 518 } 519 } 520 return (buf); 521 } 522 523 /* lookup a name in a list */ 524 struct name_entry * 525 lookup_name_list(struct name_list *list, const char *name) 526 { 527 struct name_entry *nm; 528 LIST_FOREACH(nm, list, nm_entry) 529 if (strcasecmp(name, nm->nm_name) == 0) 530 return (nm); 531 532 return (NULL); 533 } 534 535 536 void 537 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 538 { 539 struct pf_osfp_ioctl fptmp; 540 struct name_entry *nm_class, *nm_version, *nm_subtype; 541 int class, version, subtype; 542 543 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 544 #define EXPAND(field) do { \ 545 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 546 /* pick major version out of #.# */ \ 547 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \ 548 _dot = fp->field[_i] - '0'; \ 549 _i += 2; \ 550 } \ 551 if (isdigit(fp->field[_i])) \ 552 _start = fp->field[_i++] - '0'; \ 553 else \ 554 break; \ 555 if (isdigit(fp->field[_i])) \ 556 _start = (_start * 10) + fp->field[_i++] - '0'; \ 557 if (fp->field[_i++] != '-') \ 558 break; \ 559 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \ 560 fp->field[_i] - '0' == _dot) \ 561 _i += 2; \ 562 else if (_dot != -1) \ 563 break; \ 564 if (isdigit(fp->field[_i])) \ 565 _end = fp->field[_i++] - '0'; \ 566 else \ 567 break; \ 568 if (isdigit(fp->field[_i])) \ 569 _end = (_end * 10) + fp->field[_i++] - '0'; \ 570 if (isdigit(fp->field[_i])) \ 571 _end = (_end * 10) + fp->field[_i++] - '0'; \ 572 if (fp->field[_i] != '\0') \ 573 break; \ 574 memcpy(&fptmp, fp, sizeof(fptmp)); \ 575 for (;_start <= _end; _start++) { \ 576 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 577 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 578 if (_dot == -1) \ 579 snprintf(fptmp.field, sizeof(fptmp.field), \ 580 "%d", _start); \ 581 else \ 582 snprintf(fptmp.field, sizeof(fptmp.field), \ 583 "%d.%d", _dot, _start); \ 584 add_fingerprint(dev, opts, &fptmp); \ 585 } \ 586 } while(0) 587 588 /* We allow "#-#" as a version or subtype and we'll expand it */ 589 EXPAND(fp_os.fp_version_nm); 590 EXPAND(fp_os.fp_subtype_nm); 591 592 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 593 errx(1, "fingerprint class \"nomatch\" is reserved"); 594 595 version = PF_OSFP_ANY; 596 subtype = PF_OSFP_ANY; 597 598 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 599 if (nm_class->nm_num == 0) 600 nm_class->nm_num = ++class_count; 601 class = nm_class->nm_num; 602 603 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 604 fp->fp_os.fp_version_nm); 605 if (nm_version) { 606 if (nm_version->nm_num == 0) 607 nm_version->nm_num = ++nm_class->nm_sublist_num; 608 version = nm_version->nm_num; 609 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 610 fp->fp_os.fp_subtype_nm); 611 if (nm_subtype) { 612 if (nm_subtype->nm_num == 0) 613 nm_subtype->nm_num = 614 ++nm_version->nm_sublist_num; 615 subtype = nm_subtype->nm_num; 616 } 617 } 618 619 620 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 621 print_ioctl(fp)); 622 623 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 624 fingerprint_count++; 625 626 #ifdef FAKE_PF_KERNEL 627 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 628 if ((errno = pf_osfp_add(fp))) 629 #else 630 if ((opts & PF_OPT_NOACTION) == 0 && (errno = pfctl_add_fingerprint(pfh, fp)) != 0) 631 #endif /* FAKE_PF_KERNEL */ 632 { 633 if (errno == EEXIST) { 634 warn("Duplicate signature for %s %s %s", 635 fp->fp_os.fp_class_nm, 636 fp->fp_os.fp_version_nm, 637 fp->fp_os.fp_subtype_nm); 638 639 } else { 640 err(1, "DIOCOSFPADD"); 641 } 642 } 643 } 644 645 /* import a fingerprint from the kernel */ 646 void 647 import_fingerprint(struct pf_osfp_ioctl *fp) 648 { 649 struct name_entry *nm_class, *nm_version, *nm_subtype; 650 int class, version, subtype; 651 652 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 653 654 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 655 if (nm_class->nm_num == 0) { 656 nm_class->nm_num = class; 657 class_count = MAX(class_count, class); 658 } 659 660 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 661 fp->fp_os.fp_version_nm); 662 if (nm_version) { 663 if (nm_version->nm_num == 0) { 664 nm_version->nm_num = version; 665 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num, 666 version); 667 } 668 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 669 fp->fp_os.fp_subtype_nm); 670 if (nm_subtype) { 671 if (nm_subtype->nm_num == 0) { 672 nm_subtype->nm_num = subtype; 673 nm_version->nm_sublist_num = 674 MAX(nm_version->nm_sublist_num, subtype); 675 } 676 } 677 } 678 679 680 fingerprint_count++; 681 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 682 } 683 684 /* Find an entry for a fingerprints class/version/subtype */ 685 struct name_entry * 686 fingerprint_name_entry(struct name_list *list, char *name) 687 { 688 struct name_entry *nm_entry; 689 690 if (name == NULL || strlen(name) == 0) 691 return (NULL); 692 693 LIST_FOREACH(nm_entry, list, nm_entry) { 694 if (strcasecmp(nm_entry->nm_name, name) == 0) { 695 /* We'll move this to the front of the list later */ 696 LIST_REMOVE(nm_entry, nm_entry); 697 break; 698 } 699 } 700 if (nm_entry == NULL) { 701 nm_entry = calloc(1, sizeof(*nm_entry)); 702 if (nm_entry == NULL) 703 err(1, "calloc"); 704 LIST_INIT(&nm_entry->nm_sublist); 705 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 706 } 707 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 708 return (nm_entry); 709 } 710 711 712 void 713 print_name_list(int opts, struct name_list *nml, const char *prefix) 714 { 715 char newprefix[32]; 716 struct name_entry *nm; 717 718 LIST_FOREACH(nm, nml, nm_entry) { 719 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 720 nm->nm_name); 721 printf("%s\n", newprefix); 722 print_name_list(opts, &nm->nm_sublist, newprefix); 723 } 724 } 725 726 void 727 sort_name_list(int opts, struct name_list *nml) 728 { 729 struct name_list new; 730 struct name_entry *nm, *nmsearch, *nmlast; 731 732 /* yes yes, it's a very slow sort. so sue me */ 733 734 LIST_INIT(&new); 735 736 while ((nm = LIST_FIRST(nml)) != NULL) { 737 LIST_REMOVE(nm, nm_entry); 738 nmlast = NULL; 739 LIST_FOREACH(nmsearch, &new, nm_entry) { 740 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 741 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 742 break; 743 } 744 nmlast = nmsearch; 745 } 746 if (nmsearch == NULL) { 747 if (nmlast) 748 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 749 else 750 LIST_INSERT_HEAD(&new, nm, nm_entry); 751 } 752 753 sort_name_list(opts, &nm->nm_sublist); 754 } 755 nmlast = NULL; 756 while ((nm = LIST_FIRST(&new)) != NULL) { 757 LIST_REMOVE(nm, nm_entry); 758 if (nmlast == NULL) 759 LIST_INSERT_HEAD(nml, nm, nm_entry); 760 else 761 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 762 nmlast = nm; 763 } 764 } 765 766 /* parse the next integer in a formatted config file line */ 767 int 768 get_int(char **line, size_t *len, int *var, int *mod, 769 const char *name, int flags, int max, const char *filename, int lineno) 770 { 771 int fieldlen, i; 772 char *field; 773 long val = 0; 774 775 if (mod) 776 *mod = 0; 777 *var = 0; 778 779 field = get_field(line, len, &fieldlen); 780 if (field == NULL) 781 return (1); 782 if (fieldlen == 0) { 783 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 784 return (1); 785 } 786 787 i = 0; 788 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 789 && fieldlen >= 1) { 790 switch (*field) { 791 case 'S': 792 if (mod && (flags & T_MSS)) 793 *mod = T_MSS; 794 if (fieldlen == 1) 795 return (0); 796 break; 797 case 'T': 798 if (mod && (flags & T_MTU)) 799 *mod = T_MTU; 800 if (fieldlen == 1) 801 return (0); 802 break; 803 case '*': 804 if (fieldlen != 1) { 805 fprintf(stderr, "%s:%d long '%c' %s\n", 806 filename, lineno, *field, name); 807 return (1); 808 } 809 if (mod && (flags & T_DC)) { 810 *mod = T_DC; 811 return (0); 812 } 813 case '%': 814 if (mod && (flags & T_MOD)) 815 *mod = T_MOD; 816 if (fieldlen == 1) { 817 fprintf(stderr, "%s:%d modulus %s must have a " 818 "value\n", filename, lineno, name); 819 return (1); 820 } 821 break; 822 } 823 if (mod == NULL || *mod == 0) { 824 fprintf(stderr, "%s:%d does not allow %c' %s\n", 825 filename, lineno, *field, name); 826 return (1); 827 } 828 i++; 829 } 830 831 for (; i < fieldlen; i++) { 832 if (field[i] < '0' || field[i] > '9') { 833 fprintf(stderr, "%s:%d non-digit character in %s\n", 834 filename, lineno, name); 835 return (1); 836 } 837 val = val * 10 + field[i] - '0'; 838 if (val < 0) { 839 fprintf(stderr, "%s:%d %s overflowed\n", filename, 840 lineno, name); 841 return (1); 842 } 843 } 844 845 if (val > max) { 846 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 847 name, val, max); 848 return (1); 849 } 850 *var = (int)val; 851 852 return (0); 853 } 854 855 /* parse the next string in a formatted config file line */ 856 int 857 get_str(char **line, size_t *len, char **v, const char *name, int minlen, 858 const char *filename, int lineno) 859 { 860 int fieldlen; 861 char *ptr; 862 863 ptr = get_field(line, len, &fieldlen); 864 if (ptr == NULL) 865 return (1); 866 if (fieldlen < minlen) { 867 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 868 return (1); 869 } 870 if ((*v = malloc(fieldlen + 1)) == NULL) { 871 perror("malloc()"); 872 return (1); 873 } 874 memcpy(*v, ptr, fieldlen); 875 (*v)[fieldlen] = '\0'; 876 877 return (0); 878 } 879 880 /* Parse out the TCP opts */ 881 int 882 get_tcpopts(const char *filename, int lineno, const char *tcpopts, 883 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 884 int *wscale_mod, int *ts0) 885 { 886 int i, opt; 887 888 *packed = 0; 889 *optcnt = 0; 890 *wscale = 0; 891 *wscale_mod = T_DC; 892 *mss = 0; 893 *mss_mod = T_DC; 894 *ts0 = 0; 895 if (strcmp(tcpopts, ".") == 0) 896 return (0); 897 898 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 899 switch ((opt = toupper(tcpopts[i++]))) { 900 case 'N': /* FALLTHROUGH */ 901 case 'S': 902 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 903 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 904 PF_OSFP_TCPOPT_SACK); 905 break; 906 case 'W': /* FALLTHROUGH */ 907 case 'M': { 908 int *this_mod, *this; 909 910 if (opt == 'W') { 911 this = wscale; 912 this_mod = wscale_mod; 913 } else { 914 this = mss; 915 this_mod = mss_mod; 916 } 917 *this = 0; 918 *this_mod = 0; 919 920 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 921 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 922 PF_OSFP_TCPOPT_MSS); 923 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 924 tcpopts[i + 1] == ',')) { 925 *this_mod = T_DC; 926 i++; 927 break; 928 } 929 930 if (tcpopts[i] == '%') { 931 *this_mod = T_MOD; 932 i++; 933 } 934 do { 935 if (!isdigit(tcpopts[i])) { 936 fprintf(stderr, "%s:%d unknown " 937 "character '%c' in %c TCP opt\n", 938 filename, lineno, tcpopts[i], opt); 939 return (1); 940 } 941 *this = (*this * 10) + tcpopts[i++] - '0'; 942 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 943 break; 944 } 945 case 'T': 946 if (tcpopts[i] == '0') { 947 *ts0 = 1; 948 i++; 949 } 950 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 951 PF_OSFP_TCPOPT_TS; 952 break; 953 } 954 (*optcnt) ++; 955 if (tcpopts[i] == '\0') 956 break; 957 if (tcpopts[i] != ',') { 958 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 959 filename, lineno, opt); 960 return (1); 961 } 962 i++; 963 } 964 965 return (0); 966 } 967 968 /* rip the next field ouf of a formatted config file line */ 969 char * 970 get_field(char **line, size_t *len, int *fieldlen) 971 { 972 char *ret, *ptr = *line; 973 size_t plen = *len; 974 975 976 while (plen && isspace(*ptr)) { 977 plen--; 978 ptr++; 979 } 980 ret = ptr; 981 *fieldlen = 0; 982 983 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 984 (*fieldlen)++; 985 if (plen) { 986 *line = ptr + 1; 987 *len = plen - 1; 988 } else { 989 *len = 0; 990 } 991 while (*fieldlen && isspace(ret[*fieldlen - 1])) 992 (*fieldlen)--; 993 return (ret); 994 } 995 996 997 const char * 998 print_ioctl(struct pf_osfp_ioctl *fp) 999 { 1000 static char buf[1024]; 1001 char tmp[32]; 1002 int i, opt; 1003 1004 *buf = '\0'; 1005 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1006 strlcat(buf, "*", sizeof(buf)); 1007 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1008 strlcat(buf, "S", sizeof(buf)); 1009 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1010 strlcat(buf, "T", sizeof(buf)); 1011 else { 1012 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1013 strlcat(buf, "%", sizeof(buf)); 1014 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1015 strlcat(buf, tmp, sizeof(buf)); 1016 } 1017 strlcat(buf, ":", sizeof(buf)); 1018 1019 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1020 strlcat(buf, tmp, sizeof(buf)); 1021 strlcat(buf, ":", sizeof(buf)); 1022 1023 if (fp->fp_flags & PF_OSFP_DF) 1024 strlcat(buf, "1", sizeof(buf)); 1025 else 1026 strlcat(buf, "0", sizeof(buf)); 1027 strlcat(buf, ":", sizeof(buf)); 1028 1029 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1030 strlcat(buf, "*", sizeof(buf)); 1031 else { 1032 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1033 strlcat(buf, "%", sizeof(buf)); 1034 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1035 strlcat(buf, tmp, sizeof(buf)); 1036 } 1037 strlcat(buf, ":", sizeof(buf)); 1038 1039 if (fp->fp_optcnt == 0) 1040 strlcat(buf, ".", sizeof(buf)); 1041 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1042 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1043 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1044 switch (opt) { 1045 case PF_OSFP_TCPOPT_NOP: 1046 strlcat(buf, "N", sizeof(buf)); 1047 break; 1048 case PF_OSFP_TCPOPT_SACK: 1049 strlcat(buf, "S", sizeof(buf)); 1050 break; 1051 case PF_OSFP_TCPOPT_TS: 1052 strlcat(buf, "T", sizeof(buf)); 1053 if (fp->fp_flags & PF_OSFP_TS0) 1054 strlcat(buf, "0", sizeof(buf)); 1055 break; 1056 case PF_OSFP_TCPOPT_MSS: 1057 strlcat(buf, "M", sizeof(buf)); 1058 if (fp->fp_flags & PF_OSFP_MSS_DC) 1059 strlcat(buf, "*", sizeof(buf)); 1060 else { 1061 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1062 strlcat(buf, "%", sizeof(buf)); 1063 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1064 strlcat(buf, tmp, sizeof(buf)); 1065 } 1066 break; 1067 case PF_OSFP_TCPOPT_WSCALE: 1068 strlcat(buf, "W", sizeof(buf)); 1069 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1070 strlcat(buf, "*", sizeof(buf)); 1071 else { 1072 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1073 strlcat(buf, "%", sizeof(buf)); 1074 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1075 strlcat(buf, tmp, sizeof(buf)); 1076 } 1077 break; 1078 } 1079 1080 if (i != 0) 1081 strlcat(buf, ",", sizeof(buf)); 1082 } 1083 strlcat(buf, ":", sizeof(buf)); 1084 1085 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1086 strlcat(buf, ":", sizeof(buf)); 1087 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1088 strlcat(buf, ":", sizeof(buf)); 1089 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1090 strlcat(buf, ":", sizeof(buf)); 1091 1092 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1093 (long long int)fp->fp_tcpopts); 1094 strlcat(buf, tmp, sizeof(buf)); 1095 1096 return (buf); 1097 } 1098