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[dragonfly.git] / usr.sbin / pfctl / pfctl_osfp.c
blob568def07245f0f73e7881a12b223c45bea3c0a5a
1 /* $OpenBSD: pfctl_osfp.c,v 1.8 2004/02/27 10:42:00 henning Exp $ */
2 /* $DragonFly: src/usr.sbin/pfctl/pfctl_osfp.c,v 1.1 2004/09/21 21:25:28 joerg Exp $ */
3
4 /*
5 * Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.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 #include <sys/types.h>
21 #include <sys/ioctl.h>
22 #include <sys/socket.h>
23
24 #include <net/if.h>
25 #include <net/pf/pfvar.h>
26
27 #include <ctype.h>
28 #include <err.h>
29 #include <errno.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <string.h>
33
34 #include "pfctl_parser.h"
35 #include "pfctl.h"
36
37 #ifndef MIN
38 # define MIN(a,b) (((a) < (b)) ? (a) : (b))
39 #endif /* MIN */
40 #ifndef MAX
41 # define MAX(a,b) (((a) > (b)) ? (a) : (b))
42 #endif /* MAX */
43
44
45 #if 0
46 # define DEBUG(fp, str, v...) \
47 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
48 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
49 #else
50 # define DEBUG(fp, str, v...) ((void)0)
51 #endif
52
53
54 struct name_entry;
55 LIST_HEAD(name_list, name_entry);
56 struct name_entry {
57 LIST_ENTRY(name_entry) nm_entry;
58 int nm_num;
59 char nm_name[PF_OSFP_LEN];
60
61 struct name_list nm_sublist;
62 int nm_sublist_num;
63 };
64 struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
65 int class_count;
66 int fingerprint_count;
67
68 void add_fingerprint(int, int, struct pf_osfp_ioctl *);
69 struct name_entry *fingerprint_name_entry(struct name_list *, char *);
70 void pfctl_flush_my_fingerprints(struct name_list *);
71 char *get_field(char **, size_t *, int *);
72 int get_int(char **, size_t *, int *, int *, const char *,
73 int, int, const char *, int);
74 int get_str(char **, size_t *, char **, const char *, int,
75 const char *, int);
76 int get_tcpopts(const char *, int, const char *,
77 pf_tcpopts_t *, int *, int *, int *, int *, int *,
78 int *);
79 void import_fingerprint(struct pf_osfp_ioctl *);
80 const char *print_ioctl(struct pf_osfp_ioctl *);
81 void print_name_list(int, struct name_list *, const char *);
82 void sort_name_list(int, struct name_list *);
83 struct name_entry *lookup_name_list(struct name_list *, const char *);
84
85 /* Load fingerprints from a file */
86 int
87 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
88 {
89 FILE *in;
90 char *line;
91 size_t len, i;
92 int lineno = 0;
93 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
94 wscale_mod, optcnt, ts0;
95 pf_tcpopts_t packed_tcpopts;
96 char *class, *version, *subtype, *desc, *tcpopts;
97 struct pf_osfp_ioctl fp;
98
99 pfctl_flush_my_fingerprints(&classes);
100
101 if ((in = fopen(fp_filename, "r")) == NULL) {
102 warn("fopen(%s)", fp_filename);
103 return (1);
104 }
105 class = version = subtype = desc = tcpopts = NULL;
106
107 if ((opts & PF_OPT_NOACTION) == 0)
108 pfctl_clear_fingerprints(dev, opts);
109
110 while ((line = fgetln(in, &len)) != NULL) {
111 lineno++;
112 if (class)
113 free(class);
114 if (version)
115 free(version);
116 if (subtype)
117 free(subtype);
118 if (desc)
119 free(desc);
120 if (tcpopts)
121 free(tcpopts);
122 class = version = subtype = desc = tcpopts = NULL;
123 memset(&fp, 0, sizeof(fp));
124
125 /* Chop off comment */
126 for (i = 0; i < len; i++)
127 if (line[i] == '#') {
128 len = i;
129 break;
130 }
131 /* Chop off whitespace */
132 while (len > 0 && isspace(line[len - 1]))
133 len--;
134 while (len > 0 && isspace(line[0])) {
135 len--;
136 line++;
137 }
138 if (len == 0)
139 continue;
140
141 #define T_DC 0x01 /* Allow don't care */
142 #define T_MSS 0x02 /* Allow MSS multiple */
143 #define T_MTU 0x04 /* Allow MTU multiple */
144 #define T_MOD 0x08 /* Allow modulus */
145
146 #define GET_INT(v, mod, n, ty, mx) \
147 get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
148 #define GET_STR(v, n, mn) \
149 get_str(&line, &len, &v, n, mn, fp_filename, lineno)
150
151 if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
152 T_MOD, 0xffff) ||
153 GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
154 GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
155 GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
156 8192) ||
157 GET_STR(tcpopts, "TCP Options", 1) ||
158 GET_STR(class, "OS class", 1) ||
159 GET_STR(version, "OS version", 0) ||
160 GET_STR(subtype, "OS subtype", 0) ||
161 GET_STR(desc, "OS description", 2))
162 continue;
163 if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
164 &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
165 continue;
166 if (len != 0) {
167 fprintf(stderr, "%s:%d excess field\n", fp_filename,
168 lineno);
169 continue;
170 }
171
172 fp.fp_ttl = ttl;
173 if (df)
174 fp.fp_flags |= PF_OSFP_DF;
175 switch (w_mod) {
176 case 0:
177 break;
178 case T_DC:
179 fp.fp_flags |= PF_OSFP_WSIZE_DC;
180 break;
181 case T_MSS:
182 fp.fp_flags |= PF_OSFP_WSIZE_MSS;
183 break;
184 case T_MTU:
185 fp.fp_flags |= PF_OSFP_WSIZE_MTU;
186 break;
187 case T_MOD:
188 fp.fp_flags |= PF_OSFP_WSIZE_MOD;
189 break;
190 }
191 fp.fp_wsize = window;
192
193 switch (p_mod) {
194 case T_DC:
195 fp.fp_flags |= PF_OSFP_PSIZE_DC;
196 break;
197 case T_MOD:
198 fp.fp_flags |= PF_OSFP_PSIZE_MOD;
199 }
200 fp.fp_psize = psize;
201
202
203 switch (wscale_mod) {
204 case T_DC:
205 fp.fp_flags |= PF_OSFP_WSCALE_DC;
206 break;
207 case T_MOD:
208 fp.fp_flags |= PF_OSFP_WSCALE_MOD;
209 }
210 fp.fp_wscale = wscale;
211
212 switch (mss_mod) {
213 case T_DC:
214 fp.fp_flags |= PF_OSFP_MSS_DC;
215 break;
216 case T_MOD:
217 fp.fp_flags |= PF_OSFP_MSS_MOD;
218 break;
219 }
220 fp.fp_mss = mss;
221
222 fp.fp_tcpopts = packed_tcpopts;
223 fp.fp_optcnt = optcnt;
224 if (ts0)
225 fp.fp_flags |= PF_OSFP_TS0;
226
227 if (class[0] == '@')
228 fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
229 if (class[0] == '*')
230 fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
231
232 if (class[0] == '@' || class[0] == '*')
233 strlcpy(fp.fp_os.fp_class_nm, class + 1,
234 sizeof(fp.fp_os.fp_class_nm));
235 else
236 strlcpy(fp.fp_os.fp_class_nm, class,
237 sizeof(fp.fp_os.fp_class_nm));
238 strlcpy(fp.fp_os.fp_version_nm, version,
239 sizeof(fp.fp_os.fp_version_nm));
240 strlcpy(fp.fp_os.fp_subtype_nm, subtype,
241 sizeof(fp.fp_os.fp_subtype_nm));
242
243 add_fingerprint(dev, opts, &fp);
244 }
245
246 if (class)
247 free(class);
248 if (version)
249 free(version);
250 if (subtype)
251 free(subtype);
252 if (desc)
253 free(desc);
254
255 fclose(in);
256
257 if (opts & PF_OPT_VERBOSE2)
258 printf("Loaded %d passive OS fingerprints\n",
259 fingerprint_count);
260 return (0);
261 }
262
263 /* flush the kernel's fingerprints */
264 void
265 pfctl_clear_fingerprints(int dev, int opts __unused)
266 {
267 if (ioctl(dev, DIOCOSFPFLUSH))
268 err(1, "DIOCOSFPFLUSH");
269 }
270
271 /* flush pfctl's view of the fingerprints */
272 void
273 pfctl_flush_my_fingerprints(struct name_list *list)
274 {
275 struct name_entry *nm;
276
277 while ((nm = LIST_FIRST(list)) != NULL) {
278 LIST_REMOVE(nm, nm_entry);
279 pfctl_flush_my_fingerprints(&nm->nm_sublist);
280 fingerprint_count--;
281 free(nm);
282 }
283 class_count = 0;
284 }
285
286 /* Fetch the active fingerprints from the kernel */
287 int
288 pfctl_load_fingerprints(int dev, int opts __unused)
289 {
290 struct pf_osfp_ioctl io;
291 int i;
292
293 pfctl_flush_my_fingerprints(&classes);
294
295 for (i = 0; i >= 0; i++) {
296 memset(&io, 0, sizeof(io));
297 io.fp_getnum = i;
298 if (ioctl(dev, DIOCOSFPGET, &io)) {
299 if (errno == EBUSY)
300 break;
301 warn("DIOCOSFPGET");
302 return (1);
303 }
304 import_fingerprint(&io);
305 }
306 return (0);
307 }
308
309 /* List the fingerprints */
310 void
311 pfctl_show_fingerprints(int opts)
312 {
313 if (LIST_FIRST(&classes) != NULL) {
314 if (opts & PF_OPT_SHOWALL) {
315 pfctl_print_title("OS FINGERPRINTS:");
316 printf("%u fingerprints loaded\n", fingerprint_count);
317 } else {
318 printf("Class\tVersion\tSubtype(subversion)\n");
319 printf("-----\t-------\t-------------------\n");
320 sort_name_list(opts, &classes);
321 print_name_list(opts, &classes, "");
322 }
323 }
324 }
325
326 /* Lookup a fingerprint */
327 pf_osfp_t
328 pfctl_get_fingerprint(const char *name)
329 {
330 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
331 pf_osfp_t ret = PF_OSFP_NOMATCH;
332 int class, version, subtype;
333 int unp_class, unp_version, unp_subtype;
334 int wr_len, version_len, subtype_len;
335 char *ptr, *wr_name;
336
337 if (strcasecmp(name, "unknown") == 0)
338 return (PF_OSFP_UNKNOWN);
339
340 /* Try most likely no version and no subtype */
341 if ((nm = lookup_name_list(&classes, name))) {
342 class = nm->nm_num;
343 version = PF_OSFP_ANY;
344 subtype = PF_OSFP_ANY;
345 goto found;
346 } else {
347
348 /* Chop it up into class/version/subtype */
349
350 if ((wr_name = strdup(name)) == NULL)
351 err(1, "malloc");
352 if ((ptr = index(wr_name, ' ')) == NULL) {
353 free(wr_name);
354 return (PF_OSFP_NOMATCH);
355 }
356 *ptr++ = '\0';
357
358 /* The class is easy to find since it is delimited by a space */
359 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
360 free(wr_name);
361 return (PF_OSFP_NOMATCH);
362 }
363 class = class_nm->nm_num;
364
365 /* Try no subtype */
366 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
367 {
368 version = version_nm->nm_num;
369 subtype = PF_OSFP_ANY;
370 free(wr_name);
371 goto found;
372 }
373
374
375 /*
376 * There must be a version and a subtype.
377 * We'll do some fuzzy matching to pick up things like:
378 * Linux 2.2.14 (version=2.2 subtype=14)
379 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
380 * Windows 2000 SP2 (version=2000 subtype=SP2)
381 */
382 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
383 wr_len = strlen(ptr);
384 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
385 version_len = strlen(version_nm->nm_name);
386 if (wr_len < version_len + 2 ||
387 !CONNECTOR(ptr[version_len]))
388 continue;
389 /* first part of the string must be version */
390 if (strncasecmp(ptr, version_nm->nm_name,
391 version_len))
392 continue;
393
394 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
395 nm_entry) {
396 subtype_len = strlen(subtype_nm->nm_name);
397 if (wr_len != version_len + subtype_len + 1)
398 continue;
399
400 /* last part of the string must be subtype */
401 if (strcasecmp(&ptr[version_len+1],
402 subtype_nm->nm_name) != 0)
403 continue;
404
405 /* Found it!! */
406 version = version_nm->nm_num;
407 subtype = subtype_nm->nm_num;
408 free(wr_name);
409 goto found;
410 }
411 }
412
413 free(wr_name);
414 return (PF_OSFP_NOMATCH);
415 }
416
417 found:
418 PF_OSFP_PACK(ret, class, version, subtype);
419 if (ret != PF_OSFP_NOMATCH) {
420 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
421 if (class != unp_class) {
422 fprintf(stderr, "warning: fingerprint table overflowed "
423 "classes\n");
424 return (PF_OSFP_NOMATCH);
425 }
426 if (version != unp_version) {
427 fprintf(stderr, "warning: fingerprint table overflowed "
428 "versions\n");
429 return (PF_OSFP_NOMATCH);
430 }
431 if (subtype != unp_subtype) {
432 fprintf(stderr, "warning: fingerprint table overflowed "
433 "subtypes\n");
434 return (PF_OSFP_NOMATCH);
435 }
436 }
437 if (ret == PF_OSFP_ANY) {
438 /* should never happen */
439 fprintf(stderr, "warning: fingerprint packed to 'any'\n");
440 return (PF_OSFP_NOMATCH);
441 }
442
443 return (ret);
444 }
445
446 /* Lookup a fingerprint name by ID */
447 char *
448 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
449 {
450 int class, version, subtype;
451 struct name_list *list;
452 struct name_entry *nm;
453
454 char *class_name, *version_name, *subtype_name;
455 class_name = version_name = subtype_name = NULL;
456
457 if (fp == PF_OSFP_UNKNOWN) {
458 strlcpy(buf, "unknown", len);
459 return (buf);
460 }
461 if (fp == PF_OSFP_ANY) {
462 strlcpy(buf, "any", len);
463 return (buf);
464 }
465
466 PF_OSFP_UNPACK(fp, class, version, subtype);
467 if (class >= (1 << _FP_CLASS_BITS) ||
468 version >= (1 << _FP_VERSION_BITS) ||
469 subtype >= (1 << _FP_SUBTYPE_BITS)) {
470 warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
471 strlcpy(buf, "nomatch", len);
472 return (buf);
473 }
474
475 LIST_FOREACH(nm, &classes, nm_entry) {
476 if (nm->nm_num == class) {
477 class_name = nm->nm_name;
478 if (version == PF_OSFP_ANY)
479 goto found;
480 list = &nm->nm_sublist;
481 LIST_FOREACH(nm, list, nm_entry) {
482 if (nm->nm_num == version) {
483 version_name = nm->nm_name;
484 if (subtype == PF_OSFP_ANY)
485 goto found;
486 list = &nm->nm_sublist;
487 LIST_FOREACH(nm, list, nm_entry) {
488 if (nm->nm_num == subtype) {
489 subtype_name =
490 nm->nm_name;
491 goto found;
492 }
493 } /* foreach subtype */
494 strlcpy(buf, "nomatch", len);
495 return (buf);
496 }
497 } /* foreach version */
498 strlcpy(buf, "nomatch", len);
499 return (buf);
500 }
501 } /* foreach class */
502
503 strlcpy(buf, "nomatch", len);
504 return (buf);
505
506 found:
507 snprintf(buf, len, "%s", class_name);
508 if (version_name) {
509 strlcat(buf, " ", len);
510 strlcat(buf, version_name, len);
511 if (subtype_name) {
512 if (index(version_name, ' '))
513 strlcat(buf, " ", len);
514 else if (index(version_name, '.') &&
515 isdigit(*subtype_name))
516 strlcat(buf, ".", len);
517 else
518 strlcat(buf, " ", len);
519 strlcat(buf, subtype_name, len);
520 }
521 }
522 return (buf);
523 }
524
525 /* lookup a name in a list */
526 struct name_entry *
527 lookup_name_list(struct name_list *list, const char *name)
528 {
529 struct name_entry *nm;
530 LIST_FOREACH(nm, list, nm_entry)
531 if (strcasecmp(name, nm->nm_name) == 0)
532 return (nm);
533
534 return (NULL);
535 }
536
537
538 void
539 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
540 {
541 struct pf_osfp_ioctl fptmp;
542 struct name_entry *nm_class, *nm_version, *nm_subtype;
543 int class, version, subtype;
544
545 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
546 #define EXPAND(field) do { \
547 int _dot = -1, _start = -1, _end = -1, _i = 0; \
548 /* pick major version out of #.# */ \
549 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \
550 _dot = fp->field[_i] - '0'; \
551 _i += 2; \
552 } \
553 if (isdigit(fp->field[_i])) \
554 _start = fp->field[_i++] - '0'; \
555 else \
556 break; \
557 if (isdigit(fp->field[_i])) \
558 _start = (_start * 10) + fp->field[_i++] - '0'; \
559 if (fp->field[_i++] != '-') \
560 break; \
561 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \
562 fp->field[_i] - '0' == _dot) \
563 _i += 2; \
564 else if (_dot != -1) \
565 break; \
566 if (isdigit(fp->field[_i])) \
567 _end = fp->field[_i++] - '0'; \
568 else \
569 break; \
570 if (isdigit(fp->field[_i])) \
571 _end = (_end * 10) + fp->field[_i++] - '0'; \
572 if (isdigit(fp->field[_i])) \
573 _end = (_end * 10) + fp->field[_i++] - '0'; \
574 if (fp->field[_i] != '\0') \
575 break; \
576 memcpy(&fptmp, fp, sizeof(fptmp)); \
577 for (;_start <= _end; _start++) { \
578 memset(fptmp.field, 0, sizeof(fptmp.field)); \
579 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \
580 if (_dot == -1) \
581 snprintf(fptmp.field, sizeof(fptmp.field), \
582 "%d", _start); \
583 else \
584 snprintf(fptmp.field, sizeof(fptmp.field), \
585 "%d.%d", _dot, _start); \
586 add_fingerprint(dev, opts, &fptmp); \
587 } \
588 } while(0)
589
590 /* We allow "#-#" as a version or subtype and we'll expand it */
591 EXPAND(fp_os.fp_version_nm);
592 EXPAND(fp_os.fp_subtype_nm);
593
594 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
595 errx(1, "fingerprint class \"nomatch\" is reserved");
596
597 version = PF_OSFP_ANY;
598 subtype = PF_OSFP_ANY;
599
600 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
601 if (nm_class->nm_num == 0)
602 nm_class->nm_num = ++class_count;
603 class = nm_class->nm_num;
604
605 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
606 fp->fp_os.fp_version_nm);
607 if (nm_version) {
608 if (nm_version->nm_num == 0)
609 nm_version->nm_num = ++nm_class->nm_sublist_num;
610 version = nm_version->nm_num;
611 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
612 fp->fp_os.fp_subtype_nm);
613 if (nm_subtype) {
614 if (nm_subtype->nm_num == 0)
615 nm_subtype->nm_num =
616 ++nm_version->nm_sublist_num;
617 subtype = nm_subtype->nm_num;
618 }
619 }
620
621
622 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
623 print_ioctl(fp));
624
625 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
626 fingerprint_count++;
627
628 #ifdef FAKE_PF_KERNEL
629 /* Linked to the sys/net/pf/pf_osfp.c. Call pf_osfp_add() */
630 if ((errno = pf_osfp_add(fp)))
631 #else
632 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
633 #endif /* FAKE_PF_KERNEL */
634 {
635 if (errno == EEXIST) {
636 warn("Duplicate signature for %s %s %s",
637 fp->fp_os.fp_class_nm,
638 fp->fp_os.fp_version_nm,
639 fp->fp_os.fp_subtype_nm);
640
641 } else {
642 err(1, "DIOCOSFPADD");
643 }
644 }
645 }
646
647 /* import a fingerprint from the kernel */
648 void
649 import_fingerprint(struct pf_osfp_ioctl *fp)
650 {
651 struct name_entry *nm_class, *nm_version, *nm_subtype;
652 int class, version, subtype;
653
654 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
655
656 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
657 if (nm_class->nm_num == 0) {
658 nm_class->nm_num = class;
659 class_count = MAX(class_count, class);
660 }
661
662 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
663 fp->fp_os.fp_version_nm);
664 if (nm_version) {
665 if (nm_version->nm_num == 0) {
666 nm_version->nm_num = version;
667 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
668 version);
669 }
670 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
671 fp->fp_os.fp_subtype_nm);
672 if (nm_subtype) {
673 if (nm_subtype->nm_num == 0) {
674 nm_subtype->nm_num = subtype;
675 nm_version->nm_sublist_num =
676 MAX(nm_version->nm_sublist_num, subtype);
677 }
678 }
679 }
680
681
682 fingerprint_count++;
683 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
684 }
685
686 /* Find an entry for a fingerprints class/version/subtype */
687 struct name_entry *
688 fingerprint_name_entry(struct name_list *list, char *name)
689 {
690 struct name_entry *nm_entry;
691
692 if (name == NULL || strlen(name) == 0)
693 return (NULL);
694
695 LIST_FOREACH(nm_entry, list, nm_entry) {
696 if (strcasecmp(nm_entry->nm_name, name) == 0) {
697 /* We'll move this to the front of the list later */
698 LIST_REMOVE(nm_entry, nm_entry);
699 break;
700 }
701 }
702 if (nm_entry == NULL) {
703 nm_entry = calloc(1, sizeof(*nm_entry));
704 if (nm_entry == NULL)
705 err(1, "calloc");
706 LIST_INIT(&nm_entry->nm_sublist);
707 strlcpy(nm_entry->nm_name, name,
708 sizeof(nm_entry->nm_name));
709 }
710 LIST_INSERT_HEAD(list, nm_entry, nm_entry);
711 return (nm_entry);
712 }
713
714
715 void
716 print_name_list(int opts, struct name_list *nml, const char *prefix)
717 {
718 char newprefix[32];
719 struct name_entry *nm;
720
721 LIST_FOREACH(nm, nml, nm_entry) {
722 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
723 nm->nm_name);
724 printf("%s\n", newprefix);
725 print_name_list(opts, &nm->nm_sublist, newprefix);
726 }
727 }
728
729 void
730 sort_name_list(int opts, struct name_list *nml)
731 {
732 struct name_list new;
733 struct name_entry *nm, *nmsearch, *nmlast;
734
735 /* yes yes, it's a very slow sort. so sue me */
736
737 LIST_INIT(&new);
738
739 while ((nm = LIST_FIRST(nml)) != NULL) {
740 LIST_REMOVE(nm, nm_entry);
741 nmlast = NULL;
742 LIST_FOREACH(nmsearch, &new, nm_entry) {
743 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
744 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
745 break;
746 }
747 nmlast = nmsearch;
748 }
749 if (nmsearch == NULL) {
750 if (nmlast)
751 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
752 else
753 LIST_INSERT_HEAD(&new, nm, nm_entry);
754 }
755
756 sort_name_list(opts, &nm->nm_sublist);
757 }
758 nmlast = NULL;
759 while ((nm = LIST_FIRST(&new)) != NULL) {
760 LIST_REMOVE(nm, nm_entry);
761 if (nmlast == NULL)
762 LIST_INSERT_HEAD(nml, nm, nm_entry);
763 else
764 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
765 nmlast = nm;
766 }
767 return;
768 }
769
770 /* parse the next integer in a formatted config file line */
771 int
772 get_int(char **line, size_t *len, int *var, int *mod,
773 const char *name, int flags, int max, const char *filename, int lineno)
774 {
775 int fieldlen, i;
776 char *field;
777 long val = 0;
778
779 if (mod)
780 *mod = 0;
781 *var = 0;
782
783 field = get_field(line, len, &fieldlen);
784 if (field == NULL)
785 return (1);
786 if (fieldlen == 0) {
787 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
788 return (1);
789 }
790
791 i = 0;
792 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
793 && fieldlen >= 1) {
794 switch (*field) {
795 case 'S':
796 if (mod && (flags & T_MSS))
797 *mod = T_MSS;
798 if (fieldlen == 1)
799 return (0);
800 break;
801 case 'T':
802 if (mod && (flags & T_MTU))
803 *mod = T_MTU;
804 if (fieldlen == 1)
805 return (0);
806 break;
807 case '*':
808 if (fieldlen != 1) {
809 fprintf(stderr, "%s:%d long '%c' %s\n",
810 filename, lineno, *field, name);
811 return (1);
812 }
813 if (mod && (flags & T_DC)) {
814 *mod = T_DC;
815 return (0);
816 }
817 case '%':
818 if (mod && (flags & T_MOD))
819 *mod = T_MOD;
820 if (fieldlen == 1) {
821 fprintf(stderr, "%s:%d modulus %s must have a "
822 "value\n", filename, lineno, name);
823 return (1);
824 }
825 break;
826 }
827 if (mod == NULL || *mod == 0) {
828 fprintf(stderr, "%s:%d does not allow %c' %s\n",
829 filename, lineno, *field, name);
830 return (1);
831 }
832 i++;
833 }
834
835 for (; i < fieldlen; i++) {
836 if (field[i] < '0' || field[i] > '9') {
837 fprintf(stderr, "%s:%d non-digit character in %s\n",
838 filename, lineno, name);
839 return (1);
840 }
841 val = val * 10 + field[i] - '0';
842 if (val < 0) {
843 fprintf(stderr, "%s:%d %s overflowed\n", filename,
844 lineno, name);
845 return (1);
846 }
847 }
848
849 if (val > max) {
850 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
851 name, val, max);
852 return (1);
853 }
854 *var = (int)val;
855
856 return (0);
857 }
858
859 /* parse the next string in a formatted config file line */
860 int
861 get_str(char **line, size_t *len, char **v, const char *name, int minlen,
862 const char *filename, int lineno)
863 {
864 int fieldlen;
865 char *ptr;
866
867 ptr = get_field(line, len, &fieldlen);
868 if (ptr == NULL)
869 return (1);
870 if (fieldlen < minlen) {
871 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
872 return (1);
873 }
874 if ((*v = malloc(fieldlen + 1)) == NULL) {
875 perror("malloc()");
876 return (1);
877 }
878 memcpy(*v, ptr, fieldlen);
879 (*v)[fieldlen] = '\0';
880
881 return (0);
882 }
883
884 /* Parse out the TCP opts */
885 int
886 get_tcpopts(const char *filename, int lineno, const char *tcpopts,
887 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
888 int *wscale_mod, int *ts0)
889 {
890 int i, opt;
891
892 *packed = 0;
893 *optcnt = 0;
894 *wscale = 0;
895 *wscale_mod = T_DC;
896 *mss = 0;
897 *mss_mod = T_DC;
898 *ts0 = 0;
899 if (strcmp(tcpopts, ".") == 0)
900 return (0);
901
902 for (i = 0; tcpopts[i] && (size_t)*optcnt < PF_OSFP_MAX_OPTS;) {
903 switch ((opt = toupper(tcpopts[i++]))) {
904 case 'N': /* FALLTHROUGH */
905 case 'S':
906 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
907 (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
908 PF_OSFP_TCPOPT_SACK);
909 break;
910 case 'W': /* FALLTHROUGH */
911 case 'M': {
912 int *this_mod, *this;
913
914 if (opt == 'W') {
915 this = wscale;
916 this_mod = wscale_mod;
917 } else {
918 this = mss;
919 this_mod = mss_mod;
920 }
921 *this = 0;
922 *this_mod = 0;
923
924 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
925 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
926 PF_OSFP_TCPOPT_MSS);
927 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
928 tcpopts[i + 1] == ',')) {
929 *this_mod = T_DC;
930 i++;
931 break;
932 }
933
934 if (tcpopts[i] == '%') {
935 *this_mod = T_MOD;
936 i++;
937 }
938 do {
939 if (!isdigit(tcpopts[i])) {
940 fprintf(stderr, "%s:%d unknown "
941 "character '%c' in %c TCP opt\n",
942 filename, lineno, tcpopts[i], opt);
943 return (1);
944 }
945 *this = (*this * 10) + tcpopts[i++] - '0';
946 } while(tcpopts[i] != ',' && tcpopts[i] != '\0');
947 break;
948 }
949 case 'T':
950 if (tcpopts[i] == '0') {
951 *ts0 = 1;
952 i++;
953 }
954 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
955 PF_OSFP_TCPOPT_TS;
956 break;
957 }
958 (*optcnt) ++;
959 if (tcpopts[i] == '\0')
960 break;
961 if (tcpopts[i] != ',') {
962 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
963 filename, lineno, opt);
964 return (1);
965 }
966 i++;
967 }
968
969 return (0);
970 }
971
972 /* rip the next field ouf of a formatted config file line */
973 char *
974 get_field(char **line, size_t *len, int *fieldlen)
975 {
976 char *ret, *ptr = *line;
977 size_t plen = *len;
978
979
980 while (plen && isspace(*ptr)) {
981 plen--;
982 ptr++;
983 }
984 ret = ptr;
985 *fieldlen = 0;
986
987 for (; plen > 0 && *ptr != ':'; plen--, ptr++)
988 (*fieldlen)++;
989 if (plen) {
990 *line = ptr + 1;
991 *len = plen - 1;
992 } else {
993 *len = 0;
994 }
995 while (*fieldlen && isspace(ret[*fieldlen - 1]))
996 (*fieldlen)--;
997 return (ret);
998 }
999
1000
1001 const char *
1002 print_ioctl(struct pf_osfp_ioctl *fp)
1003 {
1004 static char buf[1024];
1005 char tmp[32];
1006 int i, opt;
1007
1008 *buf = '\0';
1009 if (fp->fp_flags & PF_OSFP_WSIZE_DC)
1010 strlcat(buf, "*", sizeof(buf));
1011 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
1012 strlcat(buf, "S", sizeof(buf));
1013 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
1014 strlcat(buf, "T", sizeof(buf));
1015 else {
1016 if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
1017 strlcat(buf, "%", sizeof(buf));
1018 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
1019 strlcat(buf, tmp, sizeof(buf));
1020 }
1021 strlcat(buf, ":", sizeof(buf));
1022
1023 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
1024 strlcat(buf, tmp, sizeof(buf));
1025 strlcat(buf, ":", sizeof(buf));
1026
1027 if (fp->fp_flags & PF_OSFP_DF)
1028 strlcat(buf, "1", sizeof(buf));
1029 else
1030 strlcat(buf, "0", sizeof(buf));
1031 strlcat(buf, ":", sizeof(buf));
1032
1033 if (fp->fp_flags & PF_OSFP_PSIZE_DC)
1034 strlcat(buf, "*", sizeof(buf));
1035 else {
1036 if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
1037 strlcat(buf, "%", sizeof(buf));
1038 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
1039 strlcat(buf, tmp, sizeof(buf));
1040 }
1041 strlcat(buf, ":", sizeof(buf));
1042
1043 if (fp->fp_optcnt == 0)
1044 strlcat(buf, ".", sizeof(buf));
1045 for (i = fp->fp_optcnt - 1; i >= 0; i--) {
1046 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
1047 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
1048 switch (opt) {
1049 case PF_OSFP_TCPOPT_NOP:
1050 strlcat(buf, "N", sizeof(buf));
1051 break;
1052 case PF_OSFP_TCPOPT_SACK:
1053 strlcat(buf, "S", sizeof(buf));
1054 break;
1055 case PF_OSFP_TCPOPT_TS:
1056 strlcat(buf, "T", sizeof(buf));
1057 if (fp->fp_flags & PF_OSFP_TS0)
1058 strlcat(buf, "0", sizeof(buf));
1059 break;
1060 case PF_OSFP_TCPOPT_MSS:
1061 strlcat(buf, "M", sizeof(buf));
1062 if (fp->fp_flags & PF_OSFP_MSS_DC)
1063 strlcat(buf, "*", sizeof(buf));
1064 else {
1065 if (fp->fp_flags & PF_OSFP_MSS_MOD)
1066 strlcat(buf, "%", sizeof(buf));
1067 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
1068 strlcat(buf, tmp, sizeof(buf));
1069 }
1070 break;
1071 case PF_OSFP_TCPOPT_WSCALE:
1072 strlcat(buf, "W", sizeof(buf));
1073 if (fp->fp_flags & PF_OSFP_WSCALE_DC)
1074 strlcat(buf, "*", sizeof(buf));
1075 else {
1076 if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
1077 strlcat(buf, "%", sizeof(buf));
1078 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
1079 strlcat(buf, tmp, sizeof(buf));
1080 }
1081 break;
1082 }
1083
1084 if (i != 0)
1085 strlcat(buf, ",", sizeof(buf));
1086 }
1087 strlcat(buf, ":", sizeof(buf));
1088
1089 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
1090 strlcat(buf, ":", sizeof(buf));
1091 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
1092 strlcat(buf, ":", sizeof(buf));
1093 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
1094 strlcat(buf, ":", sizeof(buf));
1095
1096 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
1097 (long long int)fp->fp_tcpopts);
1098 strlcat(buf, tmp, sizeof(buf));
1099
1100 return (buf);
1101 }
DragonFly BSD