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/cdefs.h> 20 __FBSDID("$FreeBSD$"); 21 22 #include <sys/types.h> 23 #include <sys/ioctl.h> 24 #include <sys/socket.h> 25 26 #include <net/if.h> 27 #include <net/pfvar.h> 28 29 #include <netinet/in_systm.h> 30 #include <netinet/ip.h> 31 #include <netinet/ip6.h> 32 33 #include <ctype.h> 34 #include <err.h> 35 #include <errno.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 40 #include "pfctl_parser.h" 41 #include "pfctl.h" 42 43 #ifndef MIN 44 # define MIN(a,b) (((a) < (b)) ? (a) : (b)) 45 #endif /* MIN */ 46 #ifndef MAX 47 # define MAX(a,b) (((a) > (b)) ? (a) : (b)) 48 #endif /* MAX */ 49 50 51 #if 0 52 # define DEBUG(fp, str, v...) \ 53 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 54 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 55 #else 56 # define DEBUG(fp, str, v...) ((void)0) 57 #endif 58 59 60 struct name_entry; 61 LIST_HEAD(name_list, name_entry); 62 struct name_entry { 63 LIST_ENTRY(name_entry) nm_entry; 64 int nm_num; 65 char nm_name[PF_OSFP_LEN]; 66 67 struct name_list nm_sublist; 68 int nm_sublist_num; 69 }; 70 static struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 71 static int class_count; 72 static int fingerprint_count; 73 74 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 75 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 76 void pfctl_flush_my_fingerprints(struct name_list *); 77 char *get_field(char **, size_t *, int *); 78 int get_int(char **, size_t *, int *, int *, const char *, 79 int, int, const char *, int); 80 int get_str(char **, size_t *, char **, const char *, int, 81 const char *, int); 82 int get_tcpopts(const char *, int, const char *, 83 pf_tcpopts_t *, int *, int *, int *, int *, int *, 84 int *); 85 void import_fingerprint(struct pf_osfp_ioctl *); 86 const char *print_ioctl(struct pf_osfp_ioctl *); 87 void print_name_list(int, struct name_list *, const char *); 88 void sort_name_list(int, struct name_list *); 89 struct name_entry *lookup_name_list(struct name_list *, const char *); 90 91 /* Load fingerprints from a file */ 92 int 93 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 94 { 95 FILE *in; 96 char *line; 97 size_t len; 98 int i, lineno = 0; 99 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 100 wscale_mod, optcnt, ts0; 101 pf_tcpopts_t packed_tcpopts; 102 char *class, *version, *subtype, *desc, *tcpopts; 103 struct pf_osfp_ioctl fp; 104 105 pfctl_flush_my_fingerprints(&classes); 106 107 if ((in = pfctl_fopen(fp_filename, "r")) == NULL) { 108 warn("%s", fp_filename); 109 return (1); 110 } 111 class = version = subtype = desc = tcpopts = NULL; 112 113 if ((opts & PF_OPT_NOACTION) == 0) 114 pfctl_clear_fingerprints(dev, opts); 115 116 while ((line = fgetln(in, &len)) != NULL) { 117 lineno++; 118 if (class) 119 free(class); 120 if (version) 121 free(version); 122 if (subtype) 123 free(subtype); 124 if (desc) 125 free(desc); 126 if (tcpopts) 127 free(tcpopts); 128 class = version = subtype = desc = tcpopts = NULL; 129 memset(&fp, 0, sizeof(fp)); 130 131 /* Chop off comment */ 132 for (i = 0; i < len; i++) 133 if (line[i] == '#') { 134 len = i; 135 break; 136 } 137 /* Chop off whitespace */ 138 while (len > 0 && isspace(line[len - 1])) 139 len--; 140 while (len > 0 && isspace(line[0])) { 141 len--; 142 line++; 143 } 144 if (len == 0) 145 continue; 146 147 #define T_DC 0x01 /* Allow don't care */ 148 #define T_MSS 0x02 /* Allow MSS multiple */ 149 #define T_MTU 0x04 /* Allow MTU multiple */ 150 #define T_MOD 0x08 /* Allow modulus */ 151 152 #define GET_INT(v, mod, n, ty, mx) \ 153 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) 154 #define GET_STR(v, n, mn) \ 155 get_str(&line, &len, &v, n, mn, fp_filename, lineno) 156 157 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| 158 T_MOD, 0xffff) || 159 GET_INT(ttl, NULL, "ttl", 0, 0xff) || 160 GET_INT(df, NULL, "don't fragment frag", 0, 1) || 161 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 162 8192) || 163 GET_STR(tcpopts, "TCP Options", 1) || 164 GET_STR(class, "OS class", 1) || 165 GET_STR(version, "OS version", 0) || 166 GET_STR(subtype, "OS subtype", 0) || 167 GET_STR(desc, "OS description", 2)) 168 continue; 169 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, 170 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) 171 continue; 172 if (len != 0) { 173 fprintf(stderr, "%s:%d excess field\n", fp_filename, 174 lineno); 175 continue; 176 } 177 178 fp.fp_ttl = ttl; 179 if (df) 180 fp.fp_flags |= PF_OSFP_DF; 181 switch (w_mod) { 182 case 0: 183 break; 184 case T_DC: 185 fp.fp_flags |= PF_OSFP_WSIZE_DC; 186 break; 187 case T_MSS: 188 fp.fp_flags |= PF_OSFP_WSIZE_MSS; 189 break; 190 case T_MTU: 191 fp.fp_flags |= PF_OSFP_WSIZE_MTU; 192 break; 193 case T_MOD: 194 fp.fp_flags |= PF_OSFP_WSIZE_MOD; 195 break; 196 } 197 fp.fp_wsize = window; 198 199 switch (p_mod) { 200 case T_DC: 201 fp.fp_flags |= PF_OSFP_PSIZE_DC; 202 break; 203 case T_MOD: 204 fp.fp_flags |= PF_OSFP_PSIZE_MOD; 205 } 206 fp.fp_psize = psize; 207 208 209 switch (wscale_mod) { 210 case T_DC: 211 fp.fp_flags |= PF_OSFP_WSCALE_DC; 212 break; 213 case T_MOD: 214 fp.fp_flags |= PF_OSFP_WSCALE_MOD; 215 } 216 fp.fp_wscale = wscale; 217 218 switch (mss_mod) { 219 case T_DC: 220 fp.fp_flags |= PF_OSFP_MSS_DC; 221 break; 222 case T_MOD: 223 fp.fp_flags |= PF_OSFP_MSS_MOD; 224 break; 225 } 226 fp.fp_mss = mss; 227 228 fp.fp_tcpopts = packed_tcpopts; 229 fp.fp_optcnt = optcnt; 230 if (ts0) 231 fp.fp_flags |= PF_OSFP_TS0; 232 233 if (class[0] == '@') 234 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; 235 if (class[0] == '*') 236 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; 237 238 if (class[0] == '@' || class[0] == '*') 239 strlcpy(fp.fp_os.fp_class_nm, class + 1, 240 sizeof(fp.fp_os.fp_class_nm)); 241 else 242 strlcpy(fp.fp_os.fp_class_nm, class, 243 sizeof(fp.fp_os.fp_class_nm)); 244 strlcpy(fp.fp_os.fp_version_nm, version, 245 sizeof(fp.fp_os.fp_version_nm)); 246 strlcpy(fp.fp_os.fp_subtype_nm, subtype, 247 sizeof(fp.fp_os.fp_subtype_nm)); 248 249 add_fingerprint(dev, opts, &fp); 250 251 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6); 252 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip); 253 add_fingerprint(dev, opts, &fp); 254 } 255 256 if (class) 257 free(class); 258 if (version) 259 free(version); 260 if (subtype) 261 free(subtype); 262 if (desc) 263 free(desc); 264 if (tcpopts) 265 free(tcpopts); 266 267 fclose(in); 268 269 if (opts & PF_OPT_VERBOSE2) 270 printf("Loaded %d passive OS fingerprints\n", 271 fingerprint_count); 272 return (0); 273 } 274 275 /* flush the kernel's fingerprints */ 276 void 277 pfctl_clear_fingerprints(int dev, int opts) 278 { 279 if (ioctl(dev, DIOCOSFPFLUSH)) 280 err(1, "DIOCOSFPFLUSH"); 281 } 282 283 /* flush pfctl's view of the fingerprints */ 284 void 285 pfctl_flush_my_fingerprints(struct name_list *list) 286 { 287 struct name_entry *nm; 288 289 while ((nm = LIST_FIRST(list)) != NULL) { 290 LIST_REMOVE(nm, nm_entry); 291 pfctl_flush_my_fingerprints(&nm->nm_sublist); 292 free(nm); 293 } 294 fingerprint_count = 0; 295 class_count = 0; 296 } 297 298 /* Fetch the active fingerprints from the kernel */ 299 int 300 pfctl_load_fingerprints(int dev, int opts) 301 { 302 struct pf_osfp_ioctl io; 303 int i; 304 305 pfctl_flush_my_fingerprints(&classes); 306 307 for (i = 0; i >= 0; i++) { 308 memset(&io, 0, sizeof(io)); 309 io.fp_getnum = i; 310 if (ioctl(dev, DIOCOSFPGET, &io)) { 311 if (errno == EBUSY) 312 break; 313 warn("DIOCOSFPGET"); 314 return (1); 315 } 316 import_fingerprint(&io); 317 } 318 return (0); 319 } 320 321 /* List the fingerprints */ 322 void 323 pfctl_show_fingerprints(int opts) 324 { 325 if (LIST_FIRST(&classes) != NULL) { 326 if (opts & PF_OPT_SHOWALL) { 327 pfctl_print_title("OS FINGERPRINTS:"); 328 printf("%u fingerprints loaded\n", fingerprint_count); 329 } else { 330 printf("Class\tVersion\tSubtype(subversion)\n"); 331 printf("-----\t-------\t-------------------\n"); 332 sort_name_list(opts, &classes); 333 print_name_list(opts, &classes, ""); 334 } 335 } 336 } 337 338 /* Lookup a fingerprint */ 339 pf_osfp_t 340 pfctl_get_fingerprint(const char *name) 341 { 342 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 343 pf_osfp_t ret = PF_OSFP_NOMATCH; 344 int class, version, subtype; 345 int unp_class, unp_version, unp_subtype; 346 int wr_len, version_len, subtype_len; 347 char *ptr, *wr_name; 348 349 if (strcasecmp(name, "unknown") == 0) 350 return (PF_OSFP_UNKNOWN); 351 352 /* Try most likely no version and no subtype */ 353 if ((nm = lookup_name_list(&classes, name))) { 354 class = nm->nm_num; 355 version = PF_OSFP_ANY; 356 subtype = PF_OSFP_ANY; 357 goto found; 358 } else { 359 360 /* Chop it up into class/version/subtype */ 361 362 if ((wr_name = strdup(name)) == NULL) 363 err(1, "malloc"); 364 if ((ptr = strchr(wr_name, ' ')) == NULL) { 365 free(wr_name); 366 return (PF_OSFP_NOMATCH); 367 } 368 *ptr++ = '\0'; 369 370 /* The class is easy to find since it is delimited by a space */ 371 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 372 free(wr_name); 373 return (PF_OSFP_NOMATCH); 374 } 375 class = class_nm->nm_num; 376 377 /* Try no subtype */ 378 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 379 { 380 version = version_nm->nm_num; 381 subtype = PF_OSFP_ANY; 382 free(wr_name); 383 goto found; 384 } 385 386 387 /* 388 * There must be a version and a subtype. 389 * We'll do some fuzzy matching to pick up things like: 390 * Linux 2.2.14 (version=2.2 subtype=14) 391 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 392 * Windows 2000 SP2 (version=2000 subtype=SP2) 393 */ 394 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 395 wr_len = strlen(ptr); 396 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 397 version_len = strlen(version_nm->nm_name); 398 if (wr_len < version_len + 2 || 399 !CONNECTOR(ptr[version_len])) 400 continue; 401 /* first part of the string must be version */ 402 if (strncasecmp(ptr, version_nm->nm_name, 403 version_len)) 404 continue; 405 406 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 407 nm_entry) { 408 subtype_len = strlen(subtype_nm->nm_name); 409 if (wr_len != version_len + subtype_len + 1) 410 continue; 411 412 /* last part of the string must be subtype */ 413 if (strcasecmp(&ptr[version_len+1], 414 subtype_nm->nm_name) != 0) 415 continue; 416 417 /* Found it!! */ 418 version = version_nm->nm_num; 419 subtype = subtype_nm->nm_num; 420 free(wr_name); 421 goto found; 422 } 423 } 424 425 free(wr_name); 426 return (PF_OSFP_NOMATCH); 427 } 428 429 found: 430 PF_OSFP_PACK(ret, class, version, subtype); 431 if (ret != PF_OSFP_NOMATCH) { 432 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 433 if (class != unp_class) { 434 fprintf(stderr, "warning: fingerprint table overflowed " 435 "classes\n"); 436 return (PF_OSFP_NOMATCH); 437 } 438 if (version != unp_version) { 439 fprintf(stderr, "warning: fingerprint table overflowed " 440 "versions\n"); 441 return (PF_OSFP_NOMATCH); 442 } 443 if (subtype != unp_subtype) { 444 fprintf(stderr, "warning: fingerprint table overflowed " 445 "subtypes\n"); 446 return (PF_OSFP_NOMATCH); 447 } 448 } 449 if (ret == PF_OSFP_ANY) { 450 /* should never happen */ 451 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 452 return (PF_OSFP_NOMATCH); 453 } 454 455 return (ret); 456 } 457 458 /* Lookup a fingerprint name by ID */ 459 char * 460 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 461 { 462 int class, version, subtype; 463 struct name_list *list; 464 struct name_entry *nm; 465 466 char *class_name, *version_name, *subtype_name; 467 class_name = version_name = subtype_name = NULL; 468 469 if (fp == PF_OSFP_UNKNOWN) { 470 strlcpy(buf, "unknown", len); 471 return (buf); 472 } 473 if (fp == PF_OSFP_ANY) { 474 strlcpy(buf, "any", len); 475 return (buf); 476 } 477 478 PF_OSFP_UNPACK(fp, class, version, subtype); 479 if (class >= (1 << _FP_CLASS_BITS) || 480 version >= (1 << _FP_VERSION_BITS) || 481 subtype >= (1 << _FP_SUBTYPE_BITS)) { 482 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 483 strlcpy(buf, "nomatch", len); 484 return (buf); 485 } 486 487 LIST_FOREACH(nm, &classes, nm_entry) { 488 if (nm->nm_num == class) { 489 class_name = nm->nm_name; 490 if (version == PF_OSFP_ANY) 491 goto found; 492 list = &nm->nm_sublist; 493 LIST_FOREACH(nm, list, nm_entry) { 494 if (nm->nm_num == version) { 495 version_name = nm->nm_name; 496 if (subtype == PF_OSFP_ANY) 497 goto found; 498 list = &nm->nm_sublist; 499 LIST_FOREACH(nm, list, nm_entry) { 500 if (nm->nm_num == subtype) { 501 subtype_name = 502 nm->nm_name; 503 goto found; 504 } 505 } /* foreach subtype */ 506 strlcpy(buf, "nomatch", len); 507 return (buf); 508 } 509 } /* foreach version */ 510 strlcpy(buf, "nomatch", len); 511 return (buf); 512 } 513 } /* foreach class */ 514 515 strlcpy(buf, "nomatch", len); 516 return (buf); 517 518 found: 519 snprintf(buf, len, "%s", class_name); 520 if (version_name) { 521 strlcat(buf, " ", len); 522 strlcat(buf, version_name, len); 523 if (subtype_name) { 524 if (strchr(version_name, ' ')) 525 strlcat(buf, " ", len); 526 else if (strchr(version_name, '.') && 527 isdigit(*subtype_name)) 528 strlcat(buf, ".", len); 529 else 530 strlcat(buf, " ", len); 531 strlcat(buf, subtype_name, len); 532 } 533 } 534 return (buf); 535 } 536 537 /* lookup a name in a list */ 538 struct name_entry * 539 lookup_name_list(struct name_list *list, const char *name) 540 { 541 struct name_entry *nm; 542 LIST_FOREACH(nm, list, nm_entry) 543 if (strcasecmp(name, nm->nm_name) == 0) 544 return (nm); 545 546 return (NULL); 547 } 548 549 550 void 551 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 552 { 553 struct pf_osfp_ioctl fptmp; 554 struct name_entry *nm_class, *nm_version, *nm_subtype; 555 int class, version, subtype; 556 557 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 558 #define EXPAND(field) do { \ 559 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 560 /* pick major version out of #.# */ \ 561 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \ 562 _dot = fp->field[_i] - '0'; \ 563 _i += 2; \ 564 } \ 565 if (isdigit(fp->field[_i])) \ 566 _start = fp->field[_i++] - '0'; \ 567 else \ 568 break; \ 569 if (isdigit(fp->field[_i])) \ 570 _start = (_start * 10) + fp->field[_i++] - '0'; \ 571 if (fp->field[_i++] != '-') \ 572 break; \ 573 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \ 574 fp->field[_i] - '0' == _dot) \ 575 _i += 2; \ 576 else if (_dot != -1) \ 577 break; \ 578 if (isdigit(fp->field[_i])) \ 579 _end = fp->field[_i++] - '0'; \ 580 else \ 581 break; \ 582 if (isdigit(fp->field[_i])) \ 583 _end = (_end * 10) + fp->field[_i++] - '0'; \ 584 if (isdigit(fp->field[_i])) \ 585 _end = (_end * 10) + fp->field[_i++] - '0'; \ 586 if (fp->field[_i] != '\0') \ 587 break; \ 588 memcpy(&fptmp, fp, sizeof(fptmp)); \ 589 for (;_start <= _end; _start++) { \ 590 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 591 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 592 if (_dot == -1) \ 593 snprintf(fptmp.field, sizeof(fptmp.field), \ 594 "%d", _start); \ 595 else \ 596 snprintf(fptmp.field, sizeof(fptmp.field), \ 597 "%d.%d", _dot, _start); \ 598 add_fingerprint(dev, opts, &fptmp); \ 599 } \ 600 } while(0) 601 602 /* We allow "#-#" as a version or subtype and we'll expand it */ 603 EXPAND(fp_os.fp_version_nm); 604 EXPAND(fp_os.fp_subtype_nm); 605 606 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 607 errx(1, "fingerprint class \"nomatch\" is reserved"); 608 609 version = PF_OSFP_ANY; 610 subtype = PF_OSFP_ANY; 611 612 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 613 if (nm_class->nm_num == 0) 614 nm_class->nm_num = ++class_count; 615 class = nm_class->nm_num; 616 617 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 618 fp->fp_os.fp_version_nm); 619 if (nm_version) { 620 if (nm_version->nm_num == 0) 621 nm_version->nm_num = ++nm_class->nm_sublist_num; 622 version = nm_version->nm_num; 623 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 624 fp->fp_os.fp_subtype_nm); 625 if (nm_subtype) { 626 if (nm_subtype->nm_num == 0) 627 nm_subtype->nm_num = 628 ++nm_version->nm_sublist_num; 629 subtype = nm_subtype->nm_num; 630 } 631 } 632 633 634 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 635 print_ioctl(fp)); 636 637 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 638 fingerprint_count++; 639 640 #ifdef FAKE_PF_KERNEL 641 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 642 if ((errno = pf_osfp_add(fp))) 643 #else 644 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp)) 645 #endif /* FAKE_PF_KERNEL */ 646 { 647 if (errno == EEXIST) { 648 warn("Duplicate signature for %s %s %s", 649 fp->fp_os.fp_class_nm, 650 fp->fp_os.fp_version_nm, 651 fp->fp_os.fp_subtype_nm); 652 653 } else { 654 err(1, "DIOCOSFPADD"); 655 } 656 } 657 } 658 659 /* import a fingerprint from the kernel */ 660 void 661 import_fingerprint(struct pf_osfp_ioctl *fp) 662 { 663 struct name_entry *nm_class, *nm_version, *nm_subtype; 664 int class, version, subtype; 665 666 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 667 668 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 669 if (nm_class->nm_num == 0) { 670 nm_class->nm_num = class; 671 class_count = MAX(class_count, class); 672 } 673 674 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 675 fp->fp_os.fp_version_nm); 676 if (nm_version) { 677 if (nm_version->nm_num == 0) { 678 nm_version->nm_num = version; 679 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num, 680 version); 681 } 682 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 683 fp->fp_os.fp_subtype_nm); 684 if (nm_subtype) { 685 if (nm_subtype->nm_num == 0) { 686 nm_subtype->nm_num = subtype; 687 nm_version->nm_sublist_num = 688 MAX(nm_version->nm_sublist_num, subtype); 689 } 690 } 691 } 692 693 694 fingerprint_count++; 695 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 696 } 697 698 /* Find an entry for a fingerprints class/version/subtype */ 699 struct name_entry * 700 fingerprint_name_entry(struct name_list *list, char *name) 701 { 702 struct name_entry *nm_entry; 703 704 if (name == NULL || strlen(name) == 0) 705 return (NULL); 706 707 LIST_FOREACH(nm_entry, list, nm_entry) { 708 if (strcasecmp(nm_entry->nm_name, name) == 0) { 709 /* We'll move this to the front of the list later */ 710 LIST_REMOVE(nm_entry, nm_entry); 711 break; 712 } 713 } 714 if (nm_entry == NULL) { 715 nm_entry = calloc(1, sizeof(*nm_entry)); 716 if (nm_entry == NULL) 717 err(1, "calloc"); 718 LIST_INIT(&nm_entry->nm_sublist); 719 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 720 } 721 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 722 return (nm_entry); 723 } 724 725 726 void 727 print_name_list(int opts, struct name_list *nml, const char *prefix) 728 { 729 char newprefix[32]; 730 struct name_entry *nm; 731 732 LIST_FOREACH(nm, nml, nm_entry) { 733 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 734 nm->nm_name); 735 printf("%s\n", newprefix); 736 print_name_list(opts, &nm->nm_sublist, newprefix); 737 } 738 } 739 740 void 741 sort_name_list(int opts, struct name_list *nml) 742 { 743 struct name_list new; 744 struct name_entry *nm, *nmsearch, *nmlast; 745 746 /* yes yes, it's a very slow sort. so sue me */ 747 748 LIST_INIT(&new); 749 750 while ((nm = LIST_FIRST(nml)) != NULL) { 751 LIST_REMOVE(nm, nm_entry); 752 nmlast = NULL; 753 LIST_FOREACH(nmsearch, &new, nm_entry) { 754 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 755 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 756 break; 757 } 758 nmlast = nmsearch; 759 } 760 if (nmsearch == NULL) { 761 if (nmlast) 762 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 763 else 764 LIST_INSERT_HEAD(&new, nm, nm_entry); 765 } 766 767 sort_name_list(opts, &nm->nm_sublist); 768 } 769 nmlast = NULL; 770 while ((nm = LIST_FIRST(&new)) != NULL) { 771 LIST_REMOVE(nm, nm_entry); 772 if (nmlast == NULL) 773 LIST_INSERT_HEAD(nml, nm, nm_entry); 774 else 775 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 776 nmlast = nm; 777 } 778 } 779 780 /* parse the next integer in a formatted config file line */ 781 int 782 get_int(char **line, size_t *len, int *var, int *mod, 783 const char *name, int flags, int max, const char *filename, int lineno) 784 { 785 int fieldlen, i; 786 char *field; 787 long val = 0; 788 789 if (mod) 790 *mod = 0; 791 *var = 0; 792 793 field = get_field(line, len, &fieldlen); 794 if (field == NULL) 795 return (1); 796 if (fieldlen == 0) { 797 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 798 return (1); 799 } 800 801 i = 0; 802 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 803 && fieldlen >= 1) { 804 switch (*field) { 805 case 'S': 806 if (mod && (flags & T_MSS)) 807 *mod = T_MSS; 808 if (fieldlen == 1) 809 return (0); 810 break; 811 case 'T': 812 if (mod && (flags & T_MTU)) 813 *mod = T_MTU; 814 if (fieldlen == 1) 815 return (0); 816 break; 817 case '*': 818 if (fieldlen != 1) { 819 fprintf(stderr, "%s:%d long '%c' %s\n", 820 filename, lineno, *field, name); 821 return (1); 822 } 823 if (mod && (flags & T_DC)) { 824 *mod = T_DC; 825 return (0); 826 } 827 case '%': 828 if (mod && (flags & T_MOD)) 829 *mod = T_MOD; 830 if (fieldlen == 1) { 831 fprintf(stderr, "%s:%d modulus %s must have a " 832 "value\n", filename, lineno, name); 833 return (1); 834 } 835 break; 836 } 837 if (mod == NULL || *mod == 0) { 838 fprintf(stderr, "%s:%d does not allow %c' %s\n", 839 filename, lineno, *field, name); 840 return (1); 841 } 842 i++; 843 } 844 845 for (; i < fieldlen; i++) { 846 if (field[i] < '0' || field[i] > '9') { 847 fprintf(stderr, "%s:%d non-digit character in %s\n", 848 filename, lineno, name); 849 return (1); 850 } 851 val = val * 10 + field[i] - '0'; 852 if (val < 0) { 853 fprintf(stderr, "%s:%d %s overflowed\n", filename, 854 lineno, name); 855 return (1); 856 } 857 } 858 859 if (val > max) { 860 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 861 name, val, max); 862 return (1); 863 } 864 *var = (int)val; 865 866 return (0); 867 } 868 869 /* parse the next string in a formatted config file line */ 870 int 871 get_str(char **line, size_t *len, char **v, const char *name, int minlen, 872 const char *filename, int lineno) 873 { 874 int fieldlen; 875 char *ptr; 876 877 ptr = get_field(line, len, &fieldlen); 878 if (ptr == NULL) 879 return (1); 880 if (fieldlen < minlen) { 881 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 882 return (1); 883 } 884 if ((*v = malloc(fieldlen + 1)) == NULL) { 885 perror("malloc()"); 886 return (1); 887 } 888 memcpy(*v, ptr, fieldlen); 889 (*v)[fieldlen] = '\0'; 890 891 return (0); 892 } 893 894 /* Parse out the TCP opts */ 895 int 896 get_tcpopts(const char *filename, int lineno, const char *tcpopts, 897 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 898 int *wscale_mod, int *ts0) 899 { 900 int i, opt; 901 902 *packed = 0; 903 *optcnt = 0; 904 *wscale = 0; 905 *wscale_mod = T_DC; 906 *mss = 0; 907 *mss_mod = T_DC; 908 *ts0 = 0; 909 if (strcmp(tcpopts, ".") == 0) 910 return (0); 911 912 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 913 switch ((opt = toupper(tcpopts[i++]))) { 914 case 'N': /* FALLTHROUGH */ 915 case 'S': 916 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 917 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 918 PF_OSFP_TCPOPT_SACK); 919 break; 920 case 'W': /* FALLTHROUGH */ 921 case 'M': { 922 int *this_mod, *this; 923 924 if (opt == 'W') { 925 this = wscale; 926 this_mod = wscale_mod; 927 } else { 928 this = mss; 929 this_mod = mss_mod; 930 } 931 *this = 0; 932 *this_mod = 0; 933 934 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 935 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 936 PF_OSFP_TCPOPT_MSS); 937 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 938 tcpopts[i + 1] == ',')) { 939 *this_mod = T_DC; 940 i++; 941 break; 942 } 943 944 if (tcpopts[i] == '%') { 945 *this_mod = T_MOD; 946 i++; 947 } 948 do { 949 if (!isdigit(tcpopts[i])) { 950 fprintf(stderr, "%s:%d unknown " 951 "character '%c' in %c TCP opt\n", 952 filename, lineno, tcpopts[i], opt); 953 return (1); 954 } 955 *this = (*this * 10) + tcpopts[i++] - '0'; 956 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 957 break; 958 } 959 case 'T': 960 if (tcpopts[i] == '0') { 961 *ts0 = 1; 962 i++; 963 } 964 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 965 PF_OSFP_TCPOPT_TS; 966 break; 967 } 968 (*optcnt) ++; 969 if (tcpopts[i] == '\0') 970 break; 971 if (tcpopts[i] != ',') { 972 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 973 filename, lineno, opt); 974 return (1); 975 } 976 i++; 977 } 978 979 return (0); 980 } 981 982 /* rip the next field ouf of a formatted config file line */ 983 char * 984 get_field(char **line, size_t *len, int *fieldlen) 985 { 986 char *ret, *ptr = *line; 987 size_t plen = *len; 988 989 990 while (plen && isspace(*ptr)) { 991 plen--; 992 ptr++; 993 } 994 ret = ptr; 995 *fieldlen = 0; 996 997 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 998 (*fieldlen)++; 999 if (plen) { 1000 *line = ptr + 1; 1001 *len = plen - 1; 1002 } else { 1003 *len = 0; 1004 } 1005 while (*fieldlen && isspace(ret[*fieldlen - 1])) 1006 (*fieldlen)--; 1007 return (ret); 1008 } 1009 1010 1011 const char * 1012 print_ioctl(struct pf_osfp_ioctl *fp) 1013 { 1014 static char buf[1024]; 1015 char tmp[32]; 1016 int i, opt; 1017 1018 *buf = '\0'; 1019 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1020 strlcat(buf, "*", sizeof(buf)); 1021 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1022 strlcat(buf, "S", sizeof(buf)); 1023 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1024 strlcat(buf, "T", sizeof(buf)); 1025 else { 1026 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1027 strlcat(buf, "%", sizeof(buf)); 1028 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1029 strlcat(buf, tmp, sizeof(buf)); 1030 } 1031 strlcat(buf, ":", sizeof(buf)); 1032 1033 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1034 strlcat(buf, tmp, sizeof(buf)); 1035 strlcat(buf, ":", sizeof(buf)); 1036 1037 if (fp->fp_flags & PF_OSFP_DF) 1038 strlcat(buf, "1", sizeof(buf)); 1039 else 1040 strlcat(buf, "0", sizeof(buf)); 1041 strlcat(buf, ":", sizeof(buf)); 1042 1043 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1044 strlcat(buf, "*", sizeof(buf)); 1045 else { 1046 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1047 strlcat(buf, "%", sizeof(buf)); 1048 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1049 strlcat(buf, tmp, sizeof(buf)); 1050 } 1051 strlcat(buf, ":", sizeof(buf)); 1052 1053 if (fp->fp_optcnt == 0) 1054 strlcat(buf, ".", sizeof(buf)); 1055 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1056 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1057 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1058 switch (opt) { 1059 case PF_OSFP_TCPOPT_NOP: 1060 strlcat(buf, "N", sizeof(buf)); 1061 break; 1062 case PF_OSFP_TCPOPT_SACK: 1063 strlcat(buf, "S", sizeof(buf)); 1064 break; 1065 case PF_OSFP_TCPOPT_TS: 1066 strlcat(buf, "T", sizeof(buf)); 1067 if (fp->fp_flags & PF_OSFP_TS0) 1068 strlcat(buf, "0", sizeof(buf)); 1069 break; 1070 case PF_OSFP_TCPOPT_MSS: 1071 strlcat(buf, "M", sizeof(buf)); 1072 if (fp->fp_flags & PF_OSFP_MSS_DC) 1073 strlcat(buf, "*", sizeof(buf)); 1074 else { 1075 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1076 strlcat(buf, "%", sizeof(buf)); 1077 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1078 strlcat(buf, tmp, sizeof(buf)); 1079 } 1080 break; 1081 case PF_OSFP_TCPOPT_WSCALE: 1082 strlcat(buf, "W", sizeof(buf)); 1083 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1084 strlcat(buf, "*", sizeof(buf)); 1085 else { 1086 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1087 strlcat(buf, "%", sizeof(buf)); 1088 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1089 strlcat(buf, tmp, sizeof(buf)); 1090 } 1091 break; 1092 } 1093 1094 if (i != 0) 1095 strlcat(buf, ",", sizeof(buf)); 1096 } 1097 strlcat(buf, ":", sizeof(buf)); 1098 1099 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1100 strlcat(buf, ":", sizeof(buf)); 1101 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1102 strlcat(buf, ":", sizeof(buf)); 1103 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1104 strlcat(buf, ":", sizeof(buf)); 1105 1106 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1107 (long long int)fp->fp_tcpopts); 1108 strlcat(buf, tmp, sizeof(buf)); 1109 1110 return (buf); 1111 } 1112