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