1 /* $NetBSD: pf_osfp.c,v 1.13 2017/01/16 15:46:19 christos Exp $ */ 2 /* $OpenBSD: pf_osfp.c,v 1.12 2006/12/13 18:14:10 itojun Exp $ */ 3 4 /* 5 * Copyright (c) 2003 Mike Frantzen <frantzen (at) w4g.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 * 19 */ 20 21 #include <sys/cdefs.h> 22 __KERNEL_RCSID(0, "$NetBSD: pf_osfp.c,v 1.13 2017/01/16 15:46:19 christos Exp $"); 23 24 #ifdef _KERNEL_OPT 25 #include "opt_inet.h" 26 #endif 27 28 #include <sys/param.h> 29 #include <sys/socket.h> 30 #ifdef _KERNEL 31 # include <sys/systm.h> 32 #endif /* _KERNEL */ 33 #include <sys/mbuf.h> 34 35 #include <netinet/in.h> 36 #include <netinet/in_systm.h> 37 #include <netinet/ip.h> 38 #include <netinet/tcp.h> 39 40 #include <net/if.h> 41 #include <net/pfvar.h> 42 43 #include <netinet/ip6.h> 44 #ifdef _KERNEL 45 #include <netinet6/in6_var.h> 46 #endif 47 48 49 #ifdef _KERNEL 50 # define DPFPRINTF(format, x...) \ 51 if (pf_status.debug >= PF_DEBUG_NOISY) \ 52 printf(format , ##x) 53 typedef struct pool pool_t; 54 55 #else 56 /* Userland equivalents so we can lend code to tcpdump et al. */ 57 58 # include <arpa/inet.h> 59 # include <errno.h> 60 # include <stdio.h> 61 # include <stdlib.h> 62 # include <string.h> 63 # include <netdb.h> 64 # define pool_t int 65 # define pool_get(pool, flags) malloc(*(pool)) 66 # define pool_put(pool, item) free(item) 67 # define pool_init(pool, size, a, ao, f, m, p) (*(pool)) = (size) 68 69 # ifdef PFDEBUG 70 # include <sys/stdarg.h> 71 # define DPFPRINTF(format, x...) fprintf(stderr, format , ##x) 72 # else 73 # define DPFPRINTF(format, x...) ((void)0) 74 # endif /* PFDEBUG */ 75 #endif /* _KERNEL */ 76 77 78 SLIST_HEAD(pf_osfp_list, pf_os_fingerprint) pf_osfp_list; 79 pool_t pf_osfp_entry_pl; 80 pool_t pf_osfp_pl; 81 82 struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *, 83 struct pf_os_fingerprint *, u_int8_t); 84 struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *, 85 struct pf_os_fingerprint *); 86 void pf_osfp_insert(struct pf_osfp_list *, 87 struct pf_os_fingerprint *); 88 89 90 #ifdef _KERNEL 91 /* 92 * Passively fingerprint the OS of the host (IPv4 TCP SYN packets only) 93 * Returns the list of possible OSes. 94 */ 95 struct pf_osfp_enlist * 96 pf_osfp_fingerprint(struct pf_pdesc *pd, struct mbuf *m, int off, 97 const struct tcphdr *tcp) 98 { 99 struct ip *ip; 100 struct ip6_hdr *ip6; 101 char hdr[60]; 102 103 if ((pd->af != PF_INET && pd->af != PF_INET6) || 104 pd->proto != IPPROTO_TCP || (tcp->th_off << 2) < sizeof(*tcp)) 105 return (NULL); 106 107 if (pd->af == PF_INET) { 108 ip = mtod(m, struct ip *); 109 ip6 = (struct ip6_hdr *)NULL; 110 } else { 111 ip = (struct ip *)NULL; 112 ip6 = mtod(m, struct ip6_hdr *); 113 } 114 if (!pf_pull_hdr(m, off, hdr, tcp->th_off << 2, NULL, NULL, 115 pd->af)) return (NULL); 116 117 return (pf_osfp_fingerprint_hdr(ip, ip6, (struct tcphdr *)hdr)); 118 } 119 #endif /* _KERNEL */ 120 121 struct pf_osfp_enlist * 122 pf_osfp_fingerprint_hdr(const struct ip *ip, const struct ip6_hdr *ip6, const struct tcphdr *tcp) 123 { 124 struct pf_os_fingerprint fp, *fpresult; 125 int cnt, optlen = 0; 126 const u_int8_t *optp; 127 #ifdef _KERNEL 128 char srcname[128]; 129 #else 130 char srcname[NI_MAXHOST]; 131 #endif 132 133 if ((tcp->th_flags & (TH_SYN|TH_ACK)) != TH_SYN) 134 return (NULL); 135 if (ip) { 136 if ((ip->ip_off & htons(IP_OFFMASK)) != 0) 137 return (NULL); 138 } 139 140 memset(&fp, 0, sizeof(fp)); 141 142 if (ip) { 143 #ifndef _KERNEL 144 struct sockaddr_in sin; 145 #endif 146 147 fp.fp_psize = ntohs(ip->ip_len); 148 fp.fp_ttl = ip->ip_ttl; 149 if (ip->ip_off & htons(IP_DF)) 150 fp.fp_flags |= PF_OSFP_DF; 151 #ifdef _KERNEL 152 strlcpy(srcname, inet_ntoa(ip->ip_src), sizeof(srcname)); 153 #else 154 memset(&sin, 0, sizeof(sin)); 155 sin.sin_family = AF_INET; 156 sin.sin_len = sizeof(struct sockaddr_in); 157 sin.sin_addr = ip->ip_src; 158 (void)getnameinfo((struct sockaddr *)&sin, 159 sizeof(struct sockaddr_in), srcname, sizeof(srcname), 160 NULL, 0, NI_NUMERICHOST); 161 #endif 162 } 163 #ifdef INET6 164 else if (ip6) { 165 #ifndef _KERNEL 166 struct sockaddr_in6 sin6; 167 #endif 168 169 /* jumbo payload? */ 170 fp.fp_psize = sizeof(struct ip6_hdr) + ntohs(ip6->ip6_plen); 171 fp.fp_ttl = ip6->ip6_hlim; 172 fp.fp_flags |= PF_OSFP_DF; 173 fp.fp_flags |= PF_OSFP_INET6; 174 #ifdef _KERNEL 175 in6_print(srcname, sizeof(srcname), 176 (const struct in6_addr *)&ip6->ip6_src); 177 #else 178 memset(&sin6, 0, sizeof(sin6)); 179 sin6.sin6_family = AF_INET6; 180 sin6.sin6_len = sizeof(struct sockaddr_in6); 181 sin6.sin6_addr = ip6->ip6_src; 182 (void)getnameinfo((struct sockaddr *)&sin6, 183 sizeof(struct sockaddr_in6), srcname, sizeof(srcname), 184 NULL, 0, NI_NUMERICHOST); 185 #endif 186 } 187 #endif 188 else 189 return (NULL); 190 fp.fp_wsize = ntohs(tcp->th_win); 191 192 193 cnt = (tcp->th_off << 2) - sizeof(*tcp); 194 optp = (const u_int8_t *)((const char *)tcp + sizeof(*tcp)); 195 for (; cnt > 0; cnt -= optlen, optp += optlen) { 196 if (*optp == TCPOPT_EOL) 197 break; 198 199 fp.fp_optcnt++; 200 if (*optp == TCPOPT_NOP) { 201 fp.fp_tcpopts = (fp.fp_tcpopts << PF_OSFP_TCPOPT_BITS) | 202 PF_OSFP_TCPOPT_NOP; 203 optlen = 1; 204 } else { 205 if (cnt < 2) 206 return (NULL); 207 optlen = optp[1]; 208 if (optlen > cnt || optlen < 2) 209 return (NULL); 210 switch (*optp) { 211 case TCPOPT_MAXSEG: 212 if (optlen >= TCPOLEN_MAXSEG) 213 memcpy(&fp.fp_mss, &optp[2], 214 sizeof(fp.fp_mss)); 215 fp.fp_tcpopts = (fp.fp_tcpopts << 216 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS; 217 NTOHS(fp.fp_mss); 218 break; 219 case TCPOPT_WINDOW: 220 if (optlen >= TCPOLEN_WINDOW) 221 memcpy(&fp.fp_wscale, &optp[2], 222 sizeof(fp.fp_wscale)); 223 NTOHS(fp.fp_wscale); 224 fp.fp_tcpopts = (fp.fp_tcpopts << 225 PF_OSFP_TCPOPT_BITS) | 226 PF_OSFP_TCPOPT_WSCALE; 227 break; 228 case TCPOPT_SACK_PERMITTED: 229 fp.fp_tcpopts = (fp.fp_tcpopts << 230 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK; 231 break; 232 case TCPOPT_TIMESTAMP: 233 if (optlen >= TCPOLEN_TIMESTAMP) { 234 u_int32_t ts; 235 memcpy(&ts, &optp[2], sizeof(ts)); 236 if (ts == 0) 237 fp.fp_flags |= PF_OSFP_TS0; 238 239 } 240 fp.fp_tcpopts = (fp.fp_tcpopts << 241 PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS; 242 break; 243 default: 244 return (NULL); 245 } 246 } 247 optlen = MAX(optlen, 1); /* paranoia */ 248 } 249 250 DPFPRINTF("fingerprinted %s:%d %d:%d:%d:%d:%llx (%d) " 251 "(TS=%s,M=%s%d,W=%s%d)\n", 252 srcname, ntohs(tcp->th_sport), 253 fp.fp_wsize, fp.fp_ttl, (fp.fp_flags & PF_OSFP_DF) != 0, 254 fp.fp_psize, (long long int)fp.fp_tcpopts, fp.fp_optcnt, 255 (fp.fp_flags & PF_OSFP_TS0) ? "0" : "", 256 (fp.fp_flags & PF_OSFP_MSS_MOD) ? "%" : 257 (fp.fp_flags & PF_OSFP_MSS_DC) ? "*" : "", 258 fp.fp_mss, 259 (fp.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" : 260 (fp.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "", 261 fp.fp_wscale); 262 263 if ((fpresult = pf_osfp_find(&pf_osfp_list, &fp, 264 PF_OSFP_MAXTTL_OFFSET))) 265 return (&fpresult->fp_oses); 266 return (NULL); 267 } 268 269 /* Match a fingerprint ID against a list of OSes */ 270 int 271 pf_osfp_match(struct pf_osfp_enlist *list, pf_osfp_t os) 272 { 273 struct pf_osfp_entry *entry; 274 int os_class, os_version, os_subtype; 275 int en_class, en_version, en_subtype; 276 277 if (os == PF_OSFP_ANY) 278 return (1); 279 if (list == NULL) { 280 DPFPRINTF("osfp no match against %x\n", os); 281 return (os == PF_OSFP_UNKNOWN); 282 } 283 PF_OSFP_UNPACK(os, os_class, os_version, os_subtype); 284 SLIST_FOREACH(entry, list, fp_entry) { 285 PF_OSFP_UNPACK(entry->fp_os, en_class, en_version, en_subtype); 286 if ((os_class == PF_OSFP_ANY || en_class == os_class) && 287 (os_version == PF_OSFP_ANY || en_version == os_version) && 288 (os_subtype == PF_OSFP_ANY || en_subtype == os_subtype)) { 289 DPFPRINTF("osfp matched %s %s %s %x==%x\n", 290 entry->fp_class_nm, entry->fp_version_nm, 291 entry->fp_subtype_nm, os, entry->fp_os); 292 return (1); 293 } 294 } 295 DPFPRINTF("fingerprint 0x%x didn't match\n", os); 296 return (0); 297 } 298 299 /* Initialize the OS fingerprint system */ 300 void 301 pf_osfp_initialize(void) 302 { 303 #ifdef __NetBSD__ 304 pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0, 305 "pfosfpen", &pool_allocator_nointr, IPL_NONE); 306 pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0, 307 "pfosfp", &pool_allocator_nointr, IPL_NONE); 308 #else 309 pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0, 310 "pfosfpen", &pool_allocator_nointr); 311 pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0, 312 "pfosfp", &pool_allocator_nointr); 313 #endif /* !__NetBSD__ */ 314 SLIST_INIT(&pf_osfp_list); 315 } 316 317 #ifdef _MODULE 318 void 319 pf_osfp_destroy(void) 320 { 321 pf_osfp_flush(); 322 323 pool_destroy(&pf_osfp_pl); 324 pool_destroy(&pf_osfp_entry_pl); 325 } 326 #endif /* _MODULE */ 327 328 /* Flush the fingerprint list */ 329 void 330 pf_osfp_flush(void) 331 { 332 struct pf_os_fingerprint *fp; 333 struct pf_osfp_entry *entry; 334 335 while ((fp = SLIST_FIRST(&pf_osfp_list))) { 336 SLIST_REMOVE_HEAD(&pf_osfp_list, fp_next); 337 while ((entry = SLIST_FIRST(&fp->fp_oses))) { 338 SLIST_REMOVE_HEAD(&fp->fp_oses, fp_entry); 339 pool_put(&pf_osfp_entry_pl, entry); 340 } 341 pool_put(&pf_osfp_pl, fp); 342 } 343 } 344 345 346 /* Add a fingerprint */ 347 int 348 pf_osfp_add(struct pf_osfp_ioctl *fpioc) 349 { 350 struct pf_os_fingerprint *fp, fpadd; 351 struct pf_osfp_entry *entry; 352 353 memset(&fpadd, 0, sizeof(fpadd)); 354 fpadd.fp_tcpopts = fpioc->fp_tcpopts; 355 fpadd.fp_wsize = fpioc->fp_wsize; 356 fpadd.fp_psize = fpioc->fp_psize; 357 fpadd.fp_mss = fpioc->fp_mss; 358 fpadd.fp_flags = fpioc->fp_flags; 359 fpadd.fp_optcnt = fpioc->fp_optcnt; 360 fpadd.fp_wscale = fpioc->fp_wscale; 361 fpadd.fp_ttl = fpioc->fp_ttl; 362 363 DPFPRINTF("adding osfp %s %s %s = %s%d:%d:%d:%s%d:0x%llx %d " 364 "(TS=%s,M=%s%d,W=%s%d) %x\n", 365 fpioc->fp_os.fp_class_nm, fpioc->fp_os.fp_version_nm, 366 fpioc->fp_os.fp_subtype_nm, 367 (fpadd.fp_flags & PF_OSFP_WSIZE_MOD) ? "%" : 368 (fpadd.fp_flags & PF_OSFP_WSIZE_MSS) ? "S" : 369 (fpadd.fp_flags & PF_OSFP_WSIZE_MTU) ? "T" : 370 (fpadd.fp_flags & PF_OSFP_WSIZE_DC) ? "*" : "", 371 fpadd.fp_wsize, 372 fpadd.fp_ttl, 373 (fpadd.fp_flags & PF_OSFP_DF) ? 1 : 0, 374 (fpadd.fp_flags & PF_OSFP_PSIZE_MOD) ? "%" : 375 (fpadd.fp_flags & PF_OSFP_PSIZE_DC) ? "*" : "", 376 fpadd.fp_psize, 377 (long long int)fpadd.fp_tcpopts, fpadd.fp_optcnt, 378 (fpadd.fp_flags & PF_OSFP_TS0) ? "0" : "", 379 (fpadd.fp_flags & PF_OSFP_MSS_MOD) ? "%" : 380 (fpadd.fp_flags & PF_OSFP_MSS_DC) ? "*" : "", 381 fpadd.fp_mss, 382 (fpadd.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" : 383 (fpadd.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "", 384 fpadd.fp_wscale, 385 fpioc->fp_os.fp_os); 386 387 388 if ((fp = pf_osfp_find_exact(&pf_osfp_list, &fpadd))) { 389 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) { 390 if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os)) 391 return (EEXIST); 392 } 393 if ((entry = pool_get(&pf_osfp_entry_pl, PR_NOWAIT)) == NULL) 394 return (ENOMEM); 395 } else { 396 if ((fp = pool_get(&pf_osfp_pl, PR_NOWAIT)) == NULL) 397 return (ENOMEM); 398 memset(fp, 0, sizeof(*fp)); 399 fp->fp_tcpopts = fpioc->fp_tcpopts; 400 fp->fp_wsize = fpioc->fp_wsize; 401 fp->fp_psize = fpioc->fp_psize; 402 fp->fp_mss = fpioc->fp_mss; 403 fp->fp_flags = fpioc->fp_flags; 404 fp->fp_optcnt = fpioc->fp_optcnt; 405 fp->fp_wscale = fpioc->fp_wscale; 406 fp->fp_ttl = fpioc->fp_ttl; 407 SLIST_INIT(&fp->fp_oses); 408 if ((entry = pool_get(&pf_osfp_entry_pl, PR_NOWAIT)) == NULL) { 409 pool_put(&pf_osfp_pl, fp); 410 return (ENOMEM); 411 } 412 pf_osfp_insert(&pf_osfp_list, fp); 413 } 414 memcpy(entry, &fpioc->fp_os, sizeof(*entry)); 415 416 /* Make sure the strings are NUL terminated */ 417 entry->fp_class_nm[sizeof(entry->fp_class_nm)-1] = '\0'; 418 entry->fp_version_nm[sizeof(entry->fp_version_nm)-1] = '\0'; 419 entry->fp_subtype_nm[sizeof(entry->fp_subtype_nm)-1] = '\0'; 420 421 SLIST_INSERT_HEAD(&fp->fp_oses, entry, fp_entry); 422 423 #ifdef PFDEBUG 424 if ((fp = pf_osfp_validate())) 425 printf("Invalid fingerprint list\n"); 426 #endif /* PFDEBUG */ 427 return (0); 428 } 429 430 431 /* Find a fingerprint in the list */ 432 struct pf_os_fingerprint * 433 pf_osfp_find(struct pf_osfp_list *list, struct pf_os_fingerprint *find, 434 u_int8_t ttldiff) 435 { 436 struct pf_os_fingerprint *f; 437 438 #define MATCH_INT(_MOD, _DC, _field) \ 439 if ((f->fp_flags & _DC) == 0) { \ 440 if ((f->fp_flags & _MOD) == 0) { \ 441 if (f->_field != find->_field) \ 442 continue; \ 443 } else { \ 444 if (f->_field == 0 || find->_field % f->_field) \ 445 continue; \ 446 } \ 447 } 448 449 SLIST_FOREACH(f, list, fp_next) { 450 if (f->fp_tcpopts != find->fp_tcpopts || 451 f->fp_optcnt != find->fp_optcnt || 452 f->fp_ttl < find->fp_ttl || 453 f->fp_ttl - find->fp_ttl > ttldiff || 454 (f->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)) != 455 (find->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0))) 456 continue; 457 458 MATCH_INT(PF_OSFP_PSIZE_MOD, PF_OSFP_PSIZE_DC, fp_psize) 459 MATCH_INT(PF_OSFP_MSS_MOD, PF_OSFP_MSS_DC, fp_mss) 460 MATCH_INT(PF_OSFP_WSCALE_MOD, PF_OSFP_WSCALE_DC, fp_wscale) 461 if ((f->fp_flags & PF_OSFP_WSIZE_DC) == 0) { 462 if (f->fp_flags & PF_OSFP_WSIZE_MSS) { 463 if (find->fp_mss == 0) 464 continue; 465 466 /* Some "smart" NAT devices and DSL routers will tweak the MSS size and 467 * will set it to whatever is suitable for the link type. 468 */ 469 #define SMART_MSS 1460 470 if ((find->fp_wsize % find->fp_mss || 471 find->fp_wsize / find->fp_mss != 472 f->fp_wsize) && 473 (find->fp_wsize % SMART_MSS || 474 find->fp_wsize / SMART_MSS != 475 f->fp_wsize)) 476 continue; 477 } else if (f->fp_flags & PF_OSFP_WSIZE_MTU) { 478 if (find->fp_mss == 0) 479 continue; 480 481 #define MTUOFF (sizeof(struct ip) + sizeof(struct tcphdr)) 482 #define SMART_MTU (SMART_MSS + MTUOFF) 483 if ((find->fp_wsize % (find->fp_mss + MTUOFF) || 484 find->fp_wsize / (find->fp_mss + MTUOFF) != 485 f->fp_wsize) && 486 (find->fp_wsize % SMART_MTU || 487 find->fp_wsize / SMART_MTU != 488 f->fp_wsize)) 489 continue; 490 } else if (f->fp_flags & PF_OSFP_WSIZE_MOD) { 491 if (f->fp_wsize == 0 || find->fp_wsize % 492 f->fp_wsize) 493 continue; 494 } else { 495 if (f->fp_wsize != find->fp_wsize) 496 continue; 497 } 498 } 499 return (f); 500 } 501 502 return (NULL); 503 } 504 505 /* Find an exact fingerprint in the list */ 506 struct pf_os_fingerprint * 507 pf_osfp_find_exact(struct pf_osfp_list *list, struct pf_os_fingerprint *find) 508 { 509 struct pf_os_fingerprint *f; 510 511 SLIST_FOREACH(f, list, fp_next) { 512 if (f->fp_tcpopts == find->fp_tcpopts && 513 f->fp_wsize == find->fp_wsize && 514 f->fp_psize == find->fp_psize && 515 f->fp_mss == find->fp_mss && 516 f->fp_flags == find->fp_flags && 517 f->fp_optcnt == find->fp_optcnt && 518 f->fp_wscale == find->fp_wscale && 519 f->fp_ttl == find->fp_ttl) 520 return (f); 521 } 522 523 return (NULL); 524 } 525 526 /* Insert a fingerprint into the list */ 527 void 528 pf_osfp_insert(struct pf_osfp_list *list, struct pf_os_fingerprint *ins) 529 { 530 struct pf_os_fingerprint *f, *prev = NULL; 531 532 /* XXX need to go semi tree based. can key on tcp options */ 533 534 SLIST_FOREACH(f, list, fp_next) 535 prev = f; 536 if (prev) 537 SLIST_INSERT_AFTER(prev, ins, fp_next); 538 else 539 SLIST_INSERT_HEAD(list, ins, fp_next); 540 } 541 542 /* Fill a fingerprint by its number (from an ioctl) */ 543 int 544 pf_osfp_get(struct pf_osfp_ioctl *fpioc) 545 { 546 struct pf_os_fingerprint *fp; 547 struct pf_osfp_entry *entry; 548 int num = fpioc->fp_getnum; 549 int i = 0; 550 551 552 memset(fpioc, 0, sizeof(*fpioc)); 553 SLIST_FOREACH(fp, &pf_osfp_list, fp_next) { 554 SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) { 555 if (i++ == num) { 556 fpioc->fp_mss = fp->fp_mss; 557 fpioc->fp_wsize = fp->fp_wsize; 558 fpioc->fp_flags = fp->fp_flags; 559 fpioc->fp_psize = fp->fp_psize; 560 fpioc->fp_ttl = fp->fp_ttl; 561 fpioc->fp_wscale = fp->fp_wscale; 562 fpioc->fp_getnum = num; 563 memcpy(&fpioc->fp_os, entry, 564 sizeof(fpioc->fp_os)); 565 return (0); 566 } 567 } 568 } 569 570 return (EBUSY); 571 } 572 573 574 /* Validate that each signature is reachable */ 575 struct pf_os_fingerprint * 576 pf_osfp_validate(void) 577 { 578 struct pf_os_fingerprint *f, *f2, find; 579 580 SLIST_FOREACH(f, &pf_osfp_list, fp_next) { 581 memcpy(&find, f, sizeof(find)); 582 583 /* We do a few MSS/th_win percolations to make things unique */ 584 if (find.fp_mss == 0) 585 find.fp_mss = 128; 586 if (f->fp_flags & PF_OSFP_WSIZE_MSS) 587 find.fp_wsize *= find.fp_mss; 588 else if (f->fp_flags & PF_OSFP_WSIZE_MTU) 589 find.fp_wsize *= (find.fp_mss + 40); 590 else if (f->fp_flags & PF_OSFP_WSIZE_MOD) 591 find.fp_wsize *= 2; 592 if (f != (f2 = pf_osfp_find(&pf_osfp_list, &find, 0))) { 593 if (f2) 594 printf("Found \"%s %s %s\" instead of " 595 "\"%s %s %s\"\n", 596 SLIST_FIRST(&f2->fp_oses)->fp_class_nm, 597 SLIST_FIRST(&f2->fp_oses)->fp_version_nm, 598 SLIST_FIRST(&f2->fp_oses)->fp_subtype_nm, 599 SLIST_FIRST(&f->fp_oses)->fp_class_nm, 600 SLIST_FIRST(&f->fp_oses)->fp_version_nm, 601 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm); 602 else 603 printf("Couldn't find \"%s %s %s\"\n", 604 SLIST_FIRST(&f->fp_oses)->fp_class_nm, 605 SLIST_FIRST(&f->fp_oses)->fp_version_nm, 606 SLIST_FIRST(&f->fp_oses)->fp_subtype_nm); 607 return (f); 608 } 609 } 610 return (NULL); 611 } 612
Indexes created Sat Sep 20 22:09:52 GMT 2025