1 /* $OpenBSD: pfctl_osfp.c,v 1.23 2015/12/10 17:27:00 mmcc 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 <netinet/in.h> 24 #include <net/if.h> 25 #include <net/pfvar.h> 26 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 #define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b)) 41 42 #if 0 43 # define DEBUG(fp, str, v...) \ 44 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \ 45 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v); 46 #else 47 # define DEBUG(fp, str, v...) ((void)0) 48 #endif 49 50 51 struct name_entry; 52 LIST_HEAD(name_list, name_entry); 53 struct name_entry { 54 LIST_ENTRY(name_entry) nm_entry; 55 int nm_num; 56 char nm_name[PF_OSFP_LEN]; 57 58 struct name_list nm_sublist; 59 int nm_sublist_num; 60 }; 61 struct name_list classes = LIST_HEAD_INITIALIZER(&classes); 62 int class_count; 63 int fingerprint_count; 64 65 void add_fingerprint(int, int, struct pf_osfp_ioctl *); 66 struct name_entry *fingerprint_name_entry(struct name_list *, char *); 67 void pfctl_flush_my_fingerprints(struct name_list *); 68 char *get_field(char **, size_t *, int *); 69 int get_int(char **, size_t *, int *, int *, const char *, 70 int, int, const char *, int); 71 int get_str(char **, size_t *, char **, const char *, int, 72 const char *, int); 73 int get_tcpopts(const char *, int, const char *, 74 pf_tcpopts_t *, int *, int *, int *, int *, int *, 75 int *); 76 void import_fingerprint(struct pf_osfp_ioctl *); 77 const char *print_ioctl(struct pf_osfp_ioctl *); 78 void print_name_list(int, struct name_list *, const char *); 79 void sort_name_list(int, struct name_list *); 80 struct name_entry *lookup_name_list(struct name_list *, const char *); 81 82 /* Load fingerprints from a file */ 83 int 84 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename) 85 { 86 FILE *in; 87 char *line; 88 size_t len; 89 int i, lineno = 0; 90 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale, 91 wscale_mod, optcnt, ts0; 92 pf_tcpopts_t packed_tcpopts; 93 char *class, *version, *subtype, *desc, *tcpopts; 94 struct pf_osfp_ioctl fp; 95 96 pfctl_flush_my_fingerprints(&classes); 97 98 if ((in = pfctl_fopen(fp_filename, "r")) == NULL) { 99 warn("%s", fp_filename); 100 return (1); 101 } 102 class = version = subtype = desc = tcpopts = NULL; 103 104 if ((opts & PF_OPT_NOACTION) == 0) 105 pfctl_clear_fingerprints(dev, opts); 106 107 while ((line = fgetln(in, &len)) != NULL) { 108 lineno++; 109 free(class); 110 free(version); 111 free(subtype); 112 free(desc); 113 free(tcpopts); 114 class = version = subtype = desc = tcpopts = NULL; 115 memset(&fp, 0, sizeof(fp)); 116 117 /* Chop off comment */ 118 for (i = 0; i < len; i++) 119 if (line[i] == '#') { 120 len = i; 121 break; 122 } 123 /* Chop off whitespace */ 124 while (len > 0 && isspace((unsigned char)line[len - 1])) 125 len--; 126 while (len > 0 && isspace((unsigned char)line[0])) { 127 len--; 128 line++; 129 } 130 if (len == 0) 131 continue; 132 133 #define T_DC 0x01 /* Allow don't care */ 134 #define T_MSS 0x02 /* Allow MSS multiple */ 135 #define T_MTU 0x04 /* Allow MTU multiple */ 136 #define T_MOD 0x08 /* Allow modulus */ 137 138 #define GET_INT(v, mod, n, ty, mx) \ 139 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno) 140 #define GET_STR(v, n, mn) \ 141 get_str(&line, &len, &v, n, mn, fp_filename, lineno) 142 143 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU| 144 T_MOD, 0xffff) || 145 GET_INT(ttl, NULL, "ttl", 0, 0xff) || 146 GET_INT(df, NULL, "don't fragment frag", 0, 1) || 147 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC, 148 8192) || 149 GET_STR(tcpopts, "TCP Options", 1) || 150 GET_STR(class, "OS class", 1) || 151 GET_STR(version, "OS version", 0) || 152 GET_STR(subtype, "OS subtype", 0) || 153 GET_STR(desc, "OS description", 2)) 154 continue; 155 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts, 156 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0)) 157 continue; 158 if (len != 0) { 159 fprintf(stderr, "%s:%d excess field\n", fp_filename, 160 lineno); 161 continue; 162 } 163 164 fp.fp_ttl = ttl; 165 if (df) 166 fp.fp_flags |= PF_OSFP_DF; 167 switch (w_mod) { 168 case 0: 169 break; 170 case T_DC: 171 fp.fp_flags |= PF_OSFP_WSIZE_DC; 172 break; 173 case T_MSS: 174 fp.fp_flags |= PF_OSFP_WSIZE_MSS; 175 break; 176 case T_MTU: 177 fp.fp_flags |= PF_OSFP_WSIZE_MTU; 178 break; 179 case T_MOD: 180 fp.fp_flags |= PF_OSFP_WSIZE_MOD; 181 break; 182 } 183 fp.fp_wsize = window; 184 185 switch (p_mod) { 186 case T_DC: 187 fp.fp_flags |= PF_OSFP_PSIZE_DC; 188 break; 189 case T_MOD: 190 fp.fp_flags |= PF_OSFP_PSIZE_MOD; 191 } 192 fp.fp_psize = psize; 193 194 195 switch (wscale_mod) { 196 case T_DC: 197 fp.fp_flags |= PF_OSFP_WSCALE_DC; 198 break; 199 case T_MOD: 200 fp.fp_flags |= PF_OSFP_WSCALE_MOD; 201 } 202 fp.fp_wscale = wscale; 203 204 switch (mss_mod) { 205 case T_DC: 206 fp.fp_flags |= PF_OSFP_MSS_DC; 207 break; 208 case T_MOD: 209 fp.fp_flags |= PF_OSFP_MSS_MOD; 210 break; 211 } 212 fp.fp_mss = mss; 213 214 fp.fp_tcpopts = packed_tcpopts; 215 fp.fp_optcnt = optcnt; 216 if (ts0) 217 fp.fp_flags |= PF_OSFP_TS0; 218 219 if (class[0] == '@') 220 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC; 221 if (class[0] == '*') 222 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL; 223 224 if (class[0] == '@' || class[0] == '*') 225 strlcpy(fp.fp_os.fp_class_nm, class + 1, 226 sizeof(fp.fp_os.fp_class_nm)); 227 else 228 strlcpy(fp.fp_os.fp_class_nm, class, 229 sizeof(fp.fp_os.fp_class_nm)); 230 strlcpy(fp.fp_os.fp_version_nm, version, 231 sizeof(fp.fp_os.fp_version_nm)); 232 strlcpy(fp.fp_os.fp_subtype_nm, subtype, 233 sizeof(fp.fp_os.fp_subtype_nm)); 234 235 add_fingerprint(dev, opts, &fp); 236 237 fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6); 238 fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip); 239 add_fingerprint(dev, opts, &fp); 240 } 241 242 free(class); 243 free(version); 244 free(subtype); 245 free(desc); 246 free(tcpopts); 247 248 fclose(in); 249 250 if (opts & PF_OPT_VERBOSE2) 251 printf("Loaded %d passive OS fingerprints\n", 252 fingerprint_count); 253 return (0); 254 } 255 256 /* flush the kernel's fingerprints */ 257 void 258 pfctl_clear_fingerprints(int dev, int opts) 259 { 260 if (ioctl(dev, DIOCOSFPFLUSH)) 261 err(1, "DIOCOSFPFLUSH"); 262 } 263 264 /* flush pfctl's view of the fingerprints */ 265 void 266 pfctl_flush_my_fingerprints(struct name_list *list) 267 { 268 struct name_entry *nm; 269 270 while ((nm = LIST_FIRST(list)) != NULL) { 271 LIST_REMOVE(nm, nm_entry); 272 pfctl_flush_my_fingerprints(&nm->nm_sublist); 273 free(nm); 274 } 275 fingerprint_count = 0; 276 class_count = 0; 277 } 278 279 /* Fetch the active fingerprints from the kernel */ 280 int 281 pfctl_load_fingerprints(int dev, int opts) 282 { 283 struct pf_osfp_ioctl io; 284 int i; 285 286 pfctl_flush_my_fingerprints(&classes); 287 288 for (i = 0; i >= 0; i++) { 289 memset(&io, 0, sizeof(io)); 290 io.fp_getnum = i; 291 if (ioctl(dev, DIOCOSFPGET, &io)) { 292 if (errno == EBUSY) 293 break; 294 warn("DIOCOSFPGET"); 295 return (1); 296 } 297 import_fingerprint(&io); 298 } 299 return (0); 300 } 301 302 /* List the fingerprints */ 303 void 304 pfctl_show_fingerprints(int opts) 305 { 306 if (LIST_FIRST(&classes) != NULL) { 307 if (opts & PF_OPT_SHOWALL) { 308 pfctl_print_title("OS FINGERPRINTS:"); 309 printf("%u fingerprints loaded\n", fingerprint_count); 310 } else { 311 printf("Class\tVersion\tSubtype(subversion)\n"); 312 printf("-----\t-------\t-------------------\n"); 313 sort_name_list(opts, &classes); 314 print_name_list(opts, &classes, ""); 315 } 316 } 317 } 318 319 /* Lookup a fingerprint */ 320 pf_osfp_t 321 pfctl_get_fingerprint(const char *name) 322 { 323 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm; 324 pf_osfp_t ret = PF_OSFP_NOMATCH; 325 int class, version, subtype; 326 int unp_class, unp_version, unp_subtype; 327 int wr_len, version_len, subtype_len; 328 char *ptr, *wr_name; 329 330 if (strcasecmp(name, "unknown") == 0) 331 return (PF_OSFP_UNKNOWN); 332 333 /* Try most likely no version and no subtype */ 334 if ((nm = lookup_name_list(&classes, name))) { 335 class = nm->nm_num; 336 version = PF_OSFP_ANY; 337 subtype = PF_OSFP_ANY; 338 goto found; 339 } else { 340 341 /* Chop it up into class/version/subtype */ 342 343 if ((wr_name = strdup(name)) == NULL) 344 err(1, "malloc"); 345 if ((ptr = strchr(wr_name, ' ')) == NULL) { 346 free(wr_name); 347 return (PF_OSFP_NOMATCH); 348 } 349 *ptr++ = '\0'; 350 351 /* The class is easy to find since it is delimited by a space */ 352 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) { 353 free(wr_name); 354 return (PF_OSFP_NOMATCH); 355 } 356 class = class_nm->nm_num; 357 358 /* Try no subtype */ 359 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr))) 360 { 361 version = version_nm->nm_num; 362 subtype = PF_OSFP_ANY; 363 free(wr_name); 364 goto found; 365 } 366 367 368 /* 369 * There must be a version and a subtype. 370 * We'll do some fuzzy matching to pick up things like: 371 * Linux 2.2.14 (version=2.2 subtype=14) 372 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE) 373 * Windows 2000 SP2 (version=2000 subtype=SP2) 374 */ 375 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-') 376 wr_len = strlen(ptr); 377 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) { 378 version_len = strlen(version_nm->nm_name); 379 if (wr_len < version_len + 2 || 380 !CONNECTOR(ptr[version_len])) 381 continue; 382 /* first part of the string must be version */ 383 if (strncasecmp(ptr, version_nm->nm_name, 384 version_len)) 385 continue; 386 387 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist, 388 nm_entry) { 389 subtype_len = strlen(subtype_nm->nm_name); 390 if (wr_len != version_len + subtype_len + 1) 391 continue; 392 393 /* last part of the string must be subtype */ 394 if (strcasecmp(&ptr[version_len+1], 395 subtype_nm->nm_name) != 0) 396 continue; 397 398 /* Found it!! */ 399 version = version_nm->nm_num; 400 subtype = subtype_nm->nm_num; 401 free(wr_name); 402 goto found; 403 } 404 } 405 406 free(wr_name); 407 return (PF_OSFP_NOMATCH); 408 } 409 410 found: 411 PF_OSFP_PACK(ret, class, version, subtype); 412 if (ret != PF_OSFP_NOMATCH) { 413 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype); 414 if (class != unp_class) { 415 fprintf(stderr, "warning: fingerprint table overflowed " 416 "classes\n"); 417 return (PF_OSFP_NOMATCH); 418 } 419 if (version != unp_version) { 420 fprintf(stderr, "warning: fingerprint table overflowed " 421 "versions\n"); 422 return (PF_OSFP_NOMATCH); 423 } 424 if (subtype != unp_subtype) { 425 fprintf(stderr, "warning: fingerprint table overflowed " 426 "subtypes\n"); 427 return (PF_OSFP_NOMATCH); 428 } 429 } 430 if (ret == PF_OSFP_ANY) { 431 /* should never happen */ 432 fprintf(stderr, "warning: fingerprint packed to 'any'\n"); 433 return (PF_OSFP_NOMATCH); 434 } 435 436 return (ret); 437 } 438 439 /* Lookup a fingerprint name by ID */ 440 char * 441 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len) 442 { 443 int class, version, subtype; 444 struct name_list *list; 445 struct name_entry *nm; 446 447 char *class_name, *version_name, *subtype_name; 448 class_name = version_name = subtype_name = NULL; 449 450 if (fp == PF_OSFP_UNKNOWN) { 451 strlcpy(buf, "unknown", len); 452 return (buf); 453 } 454 if (fp == PF_OSFP_ANY) { 455 strlcpy(buf, "any", len); 456 return (buf); 457 } 458 459 PF_OSFP_UNPACK(fp, class, version, subtype); 460 if (class >= (1 << _FP_CLASS_BITS) || 461 version >= (1 << _FP_VERSION_BITS) || 462 subtype >= (1 << _FP_SUBTYPE_BITS)) { 463 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp); 464 strlcpy(buf, "nomatch", len); 465 return (buf); 466 } 467 468 LIST_FOREACH(nm, &classes, nm_entry) { 469 if (nm->nm_num == class) { 470 class_name = nm->nm_name; 471 if (version == PF_OSFP_ANY) 472 goto found; 473 list = &nm->nm_sublist; 474 LIST_FOREACH(nm, list, nm_entry) { 475 if (nm->nm_num == version) { 476 version_name = nm->nm_name; 477 if (subtype == PF_OSFP_ANY) 478 goto found; 479 list = &nm->nm_sublist; 480 LIST_FOREACH(nm, list, nm_entry) { 481 if (nm->nm_num == subtype) { 482 subtype_name = 483 nm->nm_name; 484 goto found; 485 } 486 } /* foreach subtype */ 487 strlcpy(buf, "nomatch", len); 488 return (buf); 489 } 490 } /* foreach version */ 491 strlcpy(buf, "nomatch", len); 492 return (buf); 493 } 494 } /* foreach class */ 495 496 strlcpy(buf, "nomatch", len); 497 return (buf); 498 499 found: 500 snprintf(buf, len, "%s", class_name); 501 if (version_name) { 502 strlcat(buf, " ", len); 503 strlcat(buf, version_name, len); 504 if (subtype_name) { 505 if (strchr(version_name, ' ')) 506 strlcat(buf, " ", len); 507 else if (strchr(version_name, '.') && 508 isdigit((unsigned char)*subtype_name)) 509 strlcat(buf, ".", len); 510 else 511 strlcat(buf, " ", len); 512 strlcat(buf, subtype_name, len); 513 } 514 } 515 return (buf); 516 } 517 518 /* lookup a name in a list */ 519 struct name_entry * 520 lookup_name_list(struct name_list *list, const char *name) 521 { 522 struct name_entry *nm; 523 LIST_FOREACH(nm, list, nm_entry) 524 if (strcasecmp(name, nm->nm_name) == 0) 525 return (nm); 526 527 return (NULL); 528 } 529 530 531 void 532 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp) 533 { 534 struct pf_osfp_ioctl fptmp; 535 struct name_entry *nm_class, *nm_version, *nm_subtype; 536 int class, version, subtype; 537 538 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */ 539 #define EXPAND(field) do { \ 540 int _dot = -1, _start = -1, _end = -1, _i = 0; \ 541 /* pick major version out of #.# */ \ 542 if (isdigit((unsigned char)fp->field[_i]) && \ 543 fp->field[_i+1] == '.') { \ 544 _dot = fp->field[_i] - '0'; \ 545 _i += 2; \ 546 } \ 547 if (isdigit((unsigned char)fp->field[_i])) \ 548 _start = fp->field[_i++] - '0'; \ 549 else \ 550 break; \ 551 if (isdigit((unsigned char)fp->field[_i])) \ 552 _start = (_start * 10) + fp->field[_i++] - '0'; \ 553 if (fp->field[_i++] != '-') \ 554 break; \ 555 if (isdigit((unsigned char)fp->field[_i]) && \ 556 fp->field[_i+1] == '.' && fp->field[_i] - '0' == _dot) \ 557 _i += 2; \ 558 else if (_dot != -1) \ 559 break; \ 560 if (isdigit((unsigned char)fp->field[_i])) \ 561 _end = fp->field[_i++] - '0'; \ 562 else \ 563 break; \ 564 if (isdigit((unsigned char)fp->field[_i])) \ 565 _end = (_end * 10) + fp->field[_i++] - '0'; \ 566 if (isdigit((unsigned char)fp->field[_i])) \ 567 _end = (_end * 10) + fp->field[_i++] - '0'; \ 568 if (fp->field[_i] != '\0') \ 569 break; \ 570 memcpy(&fptmp, fp, sizeof(fptmp)); \ 571 for (;_start <= _end; _start++) { \ 572 memset(fptmp.field, 0, sizeof(fptmp.field)); \ 573 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \ 574 if (_dot == -1) \ 575 snprintf(fptmp.field, sizeof(fptmp.field), \ 576 "%d", _start); \ 577 else \ 578 snprintf(fptmp.field, sizeof(fptmp.field), \ 579 "%d.%d", _dot, _start); \ 580 add_fingerprint(dev, opts, &fptmp); \ 581 } \ 582 } while(0) 583 584 /* We allow "#-#" as a version or subtype and we'll expand it */ 585 EXPAND(fp_os.fp_version_nm); 586 EXPAND(fp_os.fp_subtype_nm); 587 588 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0) 589 errx(1, "fingerprint class \"nomatch\" is reserved"); 590 591 version = PF_OSFP_ANY; 592 subtype = PF_OSFP_ANY; 593 594 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 595 if (nm_class->nm_num == 0) 596 nm_class->nm_num = ++class_count; 597 class = nm_class->nm_num; 598 599 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 600 fp->fp_os.fp_version_nm); 601 if (nm_version) { 602 if (nm_version->nm_num == 0) 603 nm_version->nm_num = ++nm_class->nm_sublist_num; 604 version = nm_version->nm_num; 605 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 606 fp->fp_os.fp_subtype_nm); 607 if (nm_subtype) { 608 if (nm_subtype->nm_num == 0) 609 nm_subtype->nm_num = 610 ++nm_version->nm_sublist_num; 611 subtype = nm_subtype->nm_num; 612 } 613 } 614 615 616 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype, 617 print_ioctl(fp)); 618 619 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype); 620 fingerprint_count++; 621 622 #ifdef FAKE_PF_KERNEL 623 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */ 624 if ((errno = pf_osfp_add(fp))) 625 #else 626 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp)) 627 #endif /* FAKE_PF_KERNEL */ 628 { 629 if (errno == EEXIST) { 630 warn("Duplicate signature for %s %s %s", 631 fp->fp_os.fp_class_nm, 632 fp->fp_os.fp_version_nm, 633 fp->fp_os.fp_subtype_nm); 634 635 } else { 636 err(1, "DIOCOSFPADD"); 637 } 638 } 639 } 640 641 /* import a fingerprint from the kernel */ 642 void 643 import_fingerprint(struct pf_osfp_ioctl *fp) 644 { 645 struct name_entry *nm_class, *nm_version, *nm_subtype; 646 int class, version, subtype; 647 648 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype); 649 650 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm); 651 if (nm_class->nm_num == 0) { 652 nm_class->nm_num = class; 653 class_count = MAXIMUM(class_count, class); 654 } 655 656 nm_version = fingerprint_name_entry(&nm_class->nm_sublist, 657 fp->fp_os.fp_version_nm); 658 if (nm_version) { 659 if (nm_version->nm_num == 0) { 660 nm_version->nm_num = version; 661 nm_class->nm_sublist_num = MAXIMUM(nm_class->nm_sublist_num, 662 version); 663 } 664 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist, 665 fp->fp_os.fp_subtype_nm); 666 if (nm_subtype) { 667 if (nm_subtype->nm_num == 0) { 668 nm_subtype->nm_num = subtype; 669 nm_version->nm_sublist_num = 670 MAXIMUM(nm_version->nm_sublist_num, subtype); 671 } 672 } 673 } 674 675 676 fingerprint_count++; 677 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype); 678 } 679 680 /* Find an entry for a fingerprints class/version/subtype */ 681 struct name_entry * 682 fingerprint_name_entry(struct name_list *list, char *name) 683 { 684 struct name_entry *nm_entry; 685 686 if (name == NULL || strlen(name) == 0) 687 return (NULL); 688 689 LIST_FOREACH(nm_entry, list, nm_entry) { 690 if (strcasecmp(nm_entry->nm_name, name) == 0) { 691 /* We'll move this to the front of the list later */ 692 LIST_REMOVE(nm_entry, nm_entry); 693 break; 694 } 695 } 696 if (nm_entry == NULL) { 697 nm_entry = calloc(1, sizeof(*nm_entry)); 698 if (nm_entry == NULL) 699 err(1, "calloc"); 700 LIST_INIT(&nm_entry->nm_sublist); 701 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name)); 702 } 703 LIST_INSERT_HEAD(list, nm_entry, nm_entry); 704 return (nm_entry); 705 } 706 707 708 void 709 print_name_list(int opts, struct name_list *nml, const char *prefix) 710 { 711 char newprefix[32]; 712 struct name_entry *nm; 713 714 LIST_FOREACH(nm, nml, nm_entry) { 715 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix, 716 nm->nm_name); 717 printf("%s\n", newprefix); 718 print_name_list(opts, &nm->nm_sublist, newprefix); 719 } 720 } 721 722 void 723 sort_name_list(int opts, struct name_list *nml) 724 { 725 struct name_list new; 726 struct name_entry *nm, *nmsearch, *nmlast; 727 728 /* yes yes, it's a very slow sort. so sue me */ 729 730 LIST_INIT(&new); 731 732 while ((nm = LIST_FIRST(nml)) != NULL) { 733 LIST_REMOVE(nm, nm_entry); 734 nmlast = NULL; 735 LIST_FOREACH(nmsearch, &new, nm_entry) { 736 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) { 737 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry); 738 break; 739 } 740 nmlast = nmsearch; 741 } 742 if (nmsearch == NULL) { 743 if (nmlast) 744 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 745 else 746 LIST_INSERT_HEAD(&new, nm, nm_entry); 747 } 748 749 sort_name_list(opts, &nm->nm_sublist); 750 } 751 nmlast = NULL; 752 while ((nm = LIST_FIRST(&new)) != NULL) { 753 LIST_REMOVE(nm, nm_entry); 754 if (nmlast == NULL) 755 LIST_INSERT_HEAD(nml, nm, nm_entry); 756 else 757 LIST_INSERT_AFTER(nmlast, nm, nm_entry); 758 nmlast = nm; 759 } 760 } 761 762 /* parse the next integer in a formatted config file line */ 763 int 764 get_int(char **line, size_t *len, int *var, int *mod, 765 const char *name, int flags, int max, const char *filename, int lineno) 766 { 767 int fieldlen, i; 768 char *field; 769 long val = 0; 770 771 if (mod) 772 *mod = 0; 773 *var = 0; 774 775 field = get_field(line, len, &fieldlen); 776 if (field == NULL) 777 return (1); 778 if (fieldlen == 0) { 779 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name); 780 return (1); 781 } 782 783 i = 0; 784 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*') 785 && fieldlen >= 1) { 786 switch (*field) { 787 case 'S': 788 if (mod && (flags & T_MSS)) 789 *mod = T_MSS; 790 if (fieldlen == 1) 791 return (0); 792 break; 793 case 'T': 794 if (mod && (flags & T_MTU)) 795 *mod = T_MTU; 796 if (fieldlen == 1) 797 return (0); 798 break; 799 case '*': 800 if (fieldlen != 1) { 801 fprintf(stderr, "%s:%d long '%c' %s\n", 802 filename, lineno, *field, name); 803 return (1); 804 } 805 if (mod && (flags & T_DC)) { 806 *mod = T_DC; 807 return (0); 808 } 809 case '%': 810 if (mod && (flags & T_MOD)) 811 *mod = T_MOD; 812 if (fieldlen == 1) { 813 fprintf(stderr, "%s:%d modulus %s must have a " 814 "value\n", filename, lineno, name); 815 return (1); 816 } 817 break; 818 } 819 if (mod == NULL || *mod == 0) { 820 fprintf(stderr, "%s:%d does not allow %c' %s\n", 821 filename, lineno, *field, name); 822 return (1); 823 } 824 i++; 825 } 826 827 for (; i < fieldlen; i++) { 828 if (field[i] < '0' || field[i] > '9') { 829 fprintf(stderr, "%s:%d non-digit character in %s\n", 830 filename, lineno, name); 831 return (1); 832 } 833 val = val * 10 + field[i] - '0'; 834 if (val < 0) { 835 fprintf(stderr, "%s:%d %s overflowed\n", filename, 836 lineno, name); 837 return (1); 838 } 839 } 840 841 if (val > max) { 842 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno, 843 name, val, max); 844 return (1); 845 } 846 *var = (int)val; 847 848 return (0); 849 } 850 851 /* parse the next string in a formatted config file line */ 852 int 853 get_str(char **line, size_t *len, char **v, const char *name, int minlen, 854 const char *filename, int lineno) 855 { 856 int fieldlen; 857 char *ptr; 858 859 ptr = get_field(line, len, &fieldlen); 860 if (ptr == NULL) 861 return (1); 862 if (fieldlen < minlen) { 863 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name); 864 return (1); 865 } 866 if ((*v = malloc(fieldlen + 1)) == NULL) { 867 perror("malloc()"); 868 return (1); 869 } 870 memcpy(*v, ptr, fieldlen); 871 (*v)[fieldlen] = '\0'; 872 873 return (0); 874 } 875 876 /* Parse out the TCP opts */ 877 int 878 get_tcpopts(const char *filename, int lineno, const char *tcpopts, 879 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale, 880 int *wscale_mod, int *ts0) 881 { 882 int i, opt; 883 884 *packed = 0; 885 *optcnt = 0; 886 *wscale = 0; 887 *wscale_mod = T_DC; 888 *mss = 0; 889 *mss_mod = T_DC; 890 *ts0 = 0; 891 if (strcmp(tcpopts, ".") == 0) 892 return (0); 893 894 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) { 895 switch ((opt = toupper((unsigned char)tcpopts[i++]))) { 896 case 'N': /* FALLTHROUGH */ 897 case 'S': 898 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 899 (opt == 'N' ? PF_OSFP_TCPOPT_NOP : 900 PF_OSFP_TCPOPT_SACK); 901 break; 902 case 'W': /* FALLTHROUGH */ 903 case 'M': { 904 int *this_mod, *this; 905 906 if (opt == 'W') { 907 this = wscale; 908 this_mod = wscale_mod; 909 } else { 910 this = mss; 911 this_mod = mss_mod; 912 } 913 *this = 0; 914 *this_mod = 0; 915 916 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 917 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE : 918 PF_OSFP_TCPOPT_MSS); 919 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' || 920 tcpopts[i + 1] == ',')) { 921 *this_mod = T_DC; 922 i++; 923 break; 924 } 925 926 if (tcpopts[i] == '%') { 927 *this_mod = T_MOD; 928 i++; 929 } 930 do { 931 if (!isdigit((unsigned char)tcpopts[i])) { 932 fprintf(stderr, "%s:%d unknown " 933 "character '%c' in %c TCP opt\n", 934 filename, lineno, tcpopts[i], opt); 935 return (1); 936 } 937 *this = (*this * 10) + tcpopts[i++] - '0'; 938 } while(tcpopts[i] != ',' && tcpopts[i] != '\0'); 939 break; 940 } 941 case 'T': 942 if (tcpopts[i] == '0') { 943 *ts0 = 1; 944 i++; 945 } 946 *packed = (*packed << PF_OSFP_TCPOPT_BITS) | 947 PF_OSFP_TCPOPT_TS; 948 break; 949 } 950 (*optcnt) ++; 951 if (tcpopts[i] == '\0') 952 break; 953 if (tcpopts[i] != ',') { 954 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n", 955 filename, lineno, opt); 956 return (1); 957 } 958 i++; 959 } 960 961 return (0); 962 } 963 964 /* rip the next field out of a formatted config file line */ 965 char * 966 get_field(char **line, size_t *len, int *fieldlen) 967 { 968 char *ret, *ptr = *line; 969 size_t plen = *len; 970 971 972 while (plen && isspace((unsigned char)*ptr)) { 973 plen--; 974 ptr++; 975 } 976 ret = ptr; 977 *fieldlen = 0; 978 979 for (; plen > 0 && *ptr != ':'; plen--, ptr++) 980 (*fieldlen)++; 981 if (plen) { 982 *line = ptr + 1; 983 *len = plen - 1; 984 } else { 985 *len = 0; 986 } 987 while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1])) 988 (*fieldlen)--; 989 return (ret); 990 } 991 992 993 const char * 994 print_ioctl(struct pf_osfp_ioctl *fp) 995 { 996 static char buf[1024]; 997 char tmp[32]; 998 int i, opt; 999 1000 *buf = '\0'; 1001 if (fp->fp_flags & PF_OSFP_WSIZE_DC) 1002 strlcat(buf, "*", sizeof(buf)); 1003 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS) 1004 strlcat(buf, "S", sizeof(buf)); 1005 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU) 1006 strlcat(buf, "T", sizeof(buf)); 1007 else { 1008 if (fp->fp_flags & PF_OSFP_WSIZE_MOD) 1009 strlcat(buf, "%", sizeof(buf)); 1010 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize); 1011 strlcat(buf, tmp, sizeof(buf)); 1012 } 1013 strlcat(buf, ":", sizeof(buf)); 1014 1015 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl); 1016 strlcat(buf, tmp, sizeof(buf)); 1017 strlcat(buf, ":", sizeof(buf)); 1018 1019 if (fp->fp_flags & PF_OSFP_DF) 1020 strlcat(buf, "1", sizeof(buf)); 1021 else 1022 strlcat(buf, "0", sizeof(buf)); 1023 strlcat(buf, ":", sizeof(buf)); 1024 1025 if (fp->fp_flags & PF_OSFP_PSIZE_DC) 1026 strlcat(buf, "*", sizeof(buf)); 1027 else { 1028 if (fp->fp_flags & PF_OSFP_PSIZE_MOD) 1029 strlcat(buf, "%", sizeof(buf)); 1030 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize); 1031 strlcat(buf, tmp, sizeof(buf)); 1032 } 1033 strlcat(buf, ":", sizeof(buf)); 1034 1035 if (fp->fp_optcnt == 0) 1036 strlcat(buf, ".", sizeof(buf)); 1037 for (i = fp->fp_optcnt - 1; i >= 0; i--) { 1038 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS); 1039 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1; 1040 switch (opt) { 1041 case PF_OSFP_TCPOPT_NOP: 1042 strlcat(buf, "N", sizeof(buf)); 1043 break; 1044 case PF_OSFP_TCPOPT_SACK: 1045 strlcat(buf, "S", sizeof(buf)); 1046 break; 1047 case PF_OSFP_TCPOPT_TS: 1048 strlcat(buf, "T", sizeof(buf)); 1049 if (fp->fp_flags & PF_OSFP_TS0) 1050 strlcat(buf, "0", sizeof(buf)); 1051 break; 1052 case PF_OSFP_TCPOPT_MSS: 1053 strlcat(buf, "M", sizeof(buf)); 1054 if (fp->fp_flags & PF_OSFP_MSS_DC) 1055 strlcat(buf, "*", sizeof(buf)); 1056 else { 1057 if (fp->fp_flags & PF_OSFP_MSS_MOD) 1058 strlcat(buf, "%", sizeof(buf)); 1059 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss); 1060 strlcat(buf, tmp, sizeof(buf)); 1061 } 1062 break; 1063 case PF_OSFP_TCPOPT_WSCALE: 1064 strlcat(buf, "W", sizeof(buf)); 1065 if (fp->fp_flags & PF_OSFP_WSCALE_DC) 1066 strlcat(buf, "*", sizeof(buf)); 1067 else { 1068 if (fp->fp_flags & PF_OSFP_WSCALE_MOD) 1069 strlcat(buf, "%", sizeof(buf)); 1070 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale); 1071 strlcat(buf, tmp, sizeof(buf)); 1072 } 1073 break; 1074 } 1075 1076 if (i != 0) 1077 strlcat(buf, ",", sizeof(buf)); 1078 } 1079 strlcat(buf, ":", sizeof(buf)); 1080 1081 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf)); 1082 strlcat(buf, ":", sizeof(buf)); 1083 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf)); 1084 strlcat(buf, ":", sizeof(buf)); 1085 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf)); 1086 strlcat(buf, ":", sizeof(buf)); 1087 1088 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt, 1089 (long long int)fp->fp_tcpopts); 1090 strlcat(buf, tmp, sizeof(buf)); 1091 1092 return (buf); 1093 } 1094