1 /* $OpenBSD: pfctl_osfp.c,v 1.4 2003/08/27 17:42:00 frantzen 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
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include <ctype.h>
26 #include <err.h>
27 #include <errno.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
31
32 #include <dnet.h>
33
34 #include "pfvar.h"
35 #include "util.h"
36 /* #include "pfctl_parser.h" */
37
38 #define FAKE_PF_KERNEL
39 #define PF_OPT_NOACTION 0x0008
40 #define PF_OPT_VERBOSE2 0x0080
41
42 int pfctl_file_fingerprints(int, int, const char *);
43 pf_osfp_t pfctl_get_fingerprint(const char *);
44 void pfctl_show_fingerprints(int);
45
46 #ifndef MIN
47 # define MIN(a,b) (((a) < (b)) ? (a) : (b))
48 #endif /* MIN */
49 #ifndef MAX
50 # define MAX(a,b) (((a) > (b)) ? (a) : (b))
51 #endif /* MAX */
52
53
54 #if 0
55 # define DEBUG(fp, str, v...) \
56 fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
57 (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
58 #else
59 # define DEBUG(fp, str, v...) ((void)0)
60 #endif
61
62
63 struct name_entry;
64 LIST_HEAD(name_list, name_entry);
65 struct name_entry {
66 LIST_ENTRY(name_entry) nm_entry;
67 int nm_num;
68 char nm_name[PF_OSFP_LEN];
69
70 struct name_list nm_sublist;
71 int nm_sublist_num;
72 };
73 struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
74 int class_count;
75 int fingerprint_count;
76
77 void add_fingerprint(int, int, struct pf_osfp_ioctl *);
78 struct name_entry *fingerprint_name_entry(struct name_list *, char *);
79 char *get_field(char **, size_t *, int *);
80 int get_int(char **, size_t *, int *, int *, const char *,
81 int, int, const char *, int);
82 int get_str(char **, size_t *, char **, const char *, int,
83 const char *, int);
84 int get_tcpopts(const char *, int, const char *,
85 pf_tcpopts_t *, int *, int *, int *, int *, int *,
86 int *);
87 void import_fingerprint(struct pf_osfp_ioctl *);
88 const char *print_ioctl(struct pf_osfp_ioctl *);
89 void print_name_list(int, struct name_list *, const char *);
90 void sort_name_list(int, struct name_list *);
91 struct name_entry *lookup_name_list(struct name_list *, const char *);
92
93 /* Load fingerprints from a file */
94 int
pfctl_file_fingerprints(int dev,int opts,const char * fp_filename)95 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
96 {
97 FILE *in;
98 char *line;
99 size_t len;
100 int i, lineno = 0;
101 int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
102 wscale_mod, optcnt, ts0;
103 pf_tcpopts_t packed_tcpopts;
104 char *class, *version, *subtype, *desc, *tcpopts;
105 struct pf_osfp_ioctl fp;
106
107 if ((in = fopen(fp_filename, "r")) == NULL) {
108 warn("fopen(%s)", fp_filename);
109 return (1);
110 }
111 class = version = subtype = desc = tcpopts = NULL;
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
249 if (class)
250 free(class);
251 if (version)
252 free(version);
253 if (subtype)
254 free(subtype);
255 if (desc)
256 free(desc);
257
258 fclose(in);
259
260 if (opts & PF_OPT_VERBOSE2)
261 printf("Loaded %d passive OS fingerprints\n",
262 fingerprint_count);
263 return (0);
264 }
265
266 /* List the fingerprints */
267 void
pfctl_show_fingerprints(int opts)268 pfctl_show_fingerprints(int opts)
269 {
270 printf("Passive OS Fingerprints:\n");
271 printf("\tClass\tVersion\tSubtype(subversion)\n");
272 printf("\t-----\t-------\t-------------------\n");
273 sort_name_list(opts, &classes);
274 print_name_list(opts, &classes, "\t");
275 }
276
277 /* Lookup a fingerprint */
278 pf_osfp_t
pfctl_get_fingerprint(const char * name)279 pfctl_get_fingerprint(const char *name)
280 {
281 struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
282 pf_osfp_t ret = PF_OSFP_NOMATCH;
283 int class, version, subtype;
284 int unp_class, unp_version, unp_subtype;
285 int wr_len, version_len, subtype_len;
286 char *ptr, *wr_name;
287
288 if (strcasecmp(name, "unknown") == 0)
289 return (PF_OSFP_UNKNOWN);
290
291 /* Try most likely no version and no subtype */
292 if ((nm = lookup_name_list(&classes, name))) {
293 class = nm->nm_num;
294 version = PF_OSFP_ANY;
295 subtype = PF_OSFP_ANY;
296 goto found;
297 } else {
298
299 /* Chop it up into class/version/subtype */
300
301 if ((wr_name = strdup(name)) == NULL)
302 err(1, "malloc");
303 if ((ptr = strchr(wr_name, ' ')) == NULL) {
304 free(wr_name);
305 return (PF_OSFP_NOMATCH);
306 }
307 *ptr++ = '\0';
308
309 /* The class is easy to find since it is delimited by a space */
310 if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
311 free(wr_name);
312 return (PF_OSFP_NOMATCH);
313 }
314 class = class_nm->nm_num;
315
316 /* Try no subtype */
317 if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
318 {
319 version = version_nm->nm_num;
320 subtype = PF_OSFP_ANY;
321 free(wr_name);
322 goto found;
323 }
324
325
326 /*
327 * There must be a version and a subtype.
328 * We'll do some fuzzy matching to pick up things like:
329 * Linux 2.2.14 (version=2.2 subtype=14)
330 * FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
331 * Windows 2000 SP2 (version=2000 subtype=SP2)
332 */
333 #define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
334 wr_len = strlen(ptr);
335 LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
336 version_len = strlen(version_nm->nm_name);
337 if (wr_len < version_len + 2 ||
338 !CONNECTOR(ptr[version_len]))
339 continue;
340 /* first part of the string must be version */
341 if (strncasecmp(ptr, version_nm->nm_name,
342 version_len))
343 continue;
344
345 LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
346 nm_entry) {
347 subtype_len = strlen(subtype_nm->nm_name);
348 if (wr_len != version_len + subtype_len + 1)
349 continue;
350
351 /* last part of the string must be subtype */
352 if (strcasecmp(&ptr[version_len+1],
353 subtype_nm->nm_name) != 0)
354 continue;
355
356 /* Found it!! */
357 version = version_nm->nm_num;
358 subtype = subtype_nm->nm_num;
359 free(wr_name);
360 goto found;
361 }
362 }
363
364 free(wr_name);
365 return (PF_OSFP_NOMATCH);
366 }
367
368 found:
369 PF_OSFP_PACK(ret, class, version, subtype);
370 if (ret != PF_OSFP_NOMATCH) {
371 PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
372 if (class != unp_class) {
373 fprintf(stderr, "warning: fingerprint table overflowed "
374 "classes\n");
375 return (PF_OSFP_NOMATCH);
376 }
377 if (version != unp_version) {
378 fprintf(stderr, "warning: fingerprint table overflowed "
379 "versions\n");
380 return (PF_OSFP_NOMATCH);
381 }
382 if (subtype != unp_subtype) {
383 fprintf(stderr, "warning: fingerprint table overflowed "
384 "subtypes\n");
385 return (PF_OSFP_NOMATCH);
386 }
387 }
388 if (ret == PF_OSFP_ANY) {
389 /* should never happen */
390 fprintf(stderr, "warning: fingerprint packed to 'any'\n");
391 return (PF_OSFP_NOMATCH);
392 }
393
394 return (ret);
395 }
396
397 /* lookup a name in a list */
398 struct name_entry *
lookup_name_list(struct name_list * list,const char * name)399 lookup_name_list(struct name_list *list, const char *name)
400 {
401 struct name_entry *nm;
402 LIST_FOREACH(nm, list, nm_entry)
403 if (strcasecmp(name, nm->nm_name) == 0)
404 return (nm);
405
406 return (NULL);
407 }
408
409 void
add_fingerprint(int dev,int opts,struct pf_osfp_ioctl * fp)410 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
411 {
412 struct pf_osfp_ioctl fptmp;
413 struct name_entry *nm_class, *nm_version, *nm_subtype;
414 int class, version, subtype;
415
416 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
417 #define EXPAND(field) do { \
418 int _dot = -1, _start = -1, _end = -1, _i = 0; \
419 /* pick major version out of #.# */ \
420 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \
421 _dot = fp->field[_i] - '0'; \
422 _i += 2; \
423 } \
424 if (isdigit(fp->field[_i])) \
425 _start = fp->field[_i++] - '0'; \
426 else \
427 break; \
428 if (isdigit(fp->field[_i])) \
429 _start = (_start * 10) + fp->field[_i++] - '0'; \
430 if (fp->field[_i++] != '-') \
431 break; \
432 if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \
433 fp->field[_i] - '0' == _dot) \
434 _i += 2; \
435 else if (_dot != -1) \
436 break; \
437 if (isdigit(fp->field[_i])) \
438 _end = fp->field[_i++] - '0'; \
439 else \
440 break; \
441 if (isdigit(fp->field[_i])) \
442 _end = (_end * 10) + fp->field[_i++] - '0'; \
443 if (isdigit(fp->field[_i])) \
444 _end = (_end * 10) + fp->field[_i++] - '0'; \
445 if (fp->field[_i] != '\0') \
446 break; \
447 memcpy(&fptmp, fp, sizeof(fptmp)); \
448 for (;_start <= _end; _start++) { \
449 memset(fptmp.field, 0, sizeof(fptmp.field)); \
450 fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \
451 if (_dot == -1) \
452 snprintf(fptmp.field, sizeof(fptmp.field), \
453 "%d", _start); \
454 else \
455 snprintf(fptmp.field, sizeof(fptmp.field), \
456 "%d.%d", _dot, _start); \
457 add_fingerprint(dev, opts, &fptmp); \
458 } \
459 } while(0)
460
461 /* We allow "#-#" as a version or subtype and we'll expand it */
462 EXPAND(fp_os.fp_version_nm);
463 EXPAND(fp_os.fp_subtype_nm);
464
465 if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
466 errx(1, "fingerprint class \"nomatch\" is reserved");
467
468 version = PF_OSFP_ANY;
469 subtype = PF_OSFP_ANY;
470
471 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
472 if (nm_class->nm_num == 0)
473 nm_class->nm_num = ++class_count;
474 class = nm_class->nm_num;
475
476 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
477 fp->fp_os.fp_version_nm);
478 if (nm_version) {
479 if (nm_version->nm_num == 0)
480 nm_version->nm_num = ++nm_class->nm_sublist_num;
481 version = nm_version->nm_num;
482 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
483 fp->fp_os.fp_subtype_nm);
484 if (nm_subtype) {
485 if (nm_subtype->nm_num == 0)
486 nm_subtype->nm_num =
487 ++nm_version->nm_sublist_num;
488 subtype = nm_subtype->nm_num;
489 }
490 }
491
492
493 DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
494 print_ioctl(fp));
495
496 PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
497 fingerprint_count++;
498
499 #ifdef FAKE_PF_KERNEL
500 /* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */
501 if ((errno = pf_osfp_add(fp)))
502 #else
503 if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
504 #endif /* FAKE_PF_KERNEL */
505 {
506 if (errno == EEXIST) {
507 warn("Duplicate signature for %s %s %s",
508 fp->fp_os.fp_class_nm,
509 fp->fp_os.fp_version_nm,
510 fp->fp_os.fp_subtype_nm);
511
512 } else {
513 err(1, "DIOCOSFPADD");
514 }
515 }
516 }
517
518 /* import a fingerprint from the kernel */
519 void
import_fingerprint(struct pf_osfp_ioctl * fp)520 import_fingerprint(struct pf_osfp_ioctl *fp)
521 {
522 struct name_entry *nm_class, *nm_version, *nm_subtype;
523 int class, version, subtype;
524
525 PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
526
527 nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
528 if (nm_class->nm_num == 0) {
529 nm_class->nm_num = class;
530 class_count = MAX(class_count, class);
531 }
532
533 nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
534 fp->fp_os.fp_version_nm);
535 if (nm_version) {
536 if (nm_version->nm_num == 0) {
537 nm_version->nm_num = version;
538 nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
539 version);
540 }
541 nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
542 fp->fp_os.fp_subtype_nm);
543 if (nm_subtype) {
544 if (nm_subtype->nm_num == 0) {
545 nm_subtype->nm_num = subtype;
546 nm_version->nm_sublist_num =
547 MAX(nm_version->nm_sublist_num, subtype);
548 }
549 }
550 }
551
552
553 fingerprint_count++;
554 DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
555 }
556
557 /* Find an entry for a fingerprints class/version/subtype */
558 struct name_entry *
fingerprint_name_entry(struct name_list * list,char * name)559 fingerprint_name_entry(struct name_list *list, char *name)
560 {
561 struct name_entry *nm_entry;
562
563 if (name == NULL || strlen(name) == 0)
564 return (NULL);
565
566 LIST_FOREACH(nm_entry, list, nm_entry) {
567 if (strcasecmp(nm_entry->nm_name, name) == 0) {
568 /* We'll move this to the front of the list later */
569 LIST_REMOVE(nm_entry, nm_entry);
570 break;
571 }
572 }
573 if (nm_entry == NULL) {
574 nm_entry = calloc(1, sizeof(*nm_entry));
575 if (nm_entry == NULL)
576 err(1, "calloc");
577 LIST_INIT(&nm_entry->nm_sublist);
578 strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
579 }
580 LIST_INSERT_HEAD(list, nm_entry, nm_entry);
581 return (nm_entry);
582 }
583
584
585 void
print_name_list(int opts,struct name_list * nml,const char * prefix)586 print_name_list(int opts, struct name_list *nml, const char *prefix)
587 {
588 char newprefix[32];
589 struct name_entry *nm;
590
591 LIST_FOREACH(nm, nml, nm_entry) {
592 snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
593 nm->nm_name);
594 printf("%s\n", newprefix);
595 print_name_list(opts, &nm->nm_sublist, newprefix);
596 }
597 }
598
599 void
sort_name_list(int opts,struct name_list * nml)600 sort_name_list(int opts, struct name_list *nml)
601 {
602 struct name_list new;
603 struct name_entry *nm, *nmsearch, *nmlast;
604
605 /* yes yes, it's a very slow sort. so sue me */
606
607 LIST_INIT(&new);
608
609 while ((nm = LIST_FIRST(nml)) != NULL) {
610 LIST_REMOVE(nm, nm_entry);
611 nmlast = NULL;
612 LIST_FOREACH(nmsearch, &new, nm_entry) {
613 if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
614 LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
615 break;
616 }
617 nmlast = nmsearch;
618 }
619 if (nmsearch == NULL) {
620 if (nmlast)
621 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
622 else
623 LIST_INSERT_HEAD(&new, nm, nm_entry);
624 }
625
626 sort_name_list(opts, &nm->nm_sublist);
627 }
628 nmlast = NULL;
629 while ((nm = LIST_FIRST(&new)) != NULL) {
630 LIST_REMOVE(nm, nm_entry);
631 if (nmlast == NULL)
632 LIST_INSERT_HEAD(nml, nm, nm_entry);
633 else
634 LIST_INSERT_AFTER(nmlast, nm, nm_entry);
635 nmlast = nm;
636 }
637 return;
638 }
639
640 /* parse the next integer in a formatted config file line */
641 int
get_int(char ** line,size_t * len,int * var,int * mod,const char * name,int flags,int max,const char * filename,int lineno)642 get_int(char **line, size_t *len, int *var, int *mod,
643 const char *name, int flags, int max, const char *filename, int lineno)
644 {
645 int fieldlen, i;
646 char *field;
647 long val = 0;
648
649 if (mod)
650 *mod = 0;
651 *var = 0;
652
653 field = get_field(line, len, &fieldlen);
654 if (field == NULL)
655 return (1);
656 if (fieldlen == 0) {
657 fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
658 return (1);
659 }
660
661 i = 0;
662 if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
663 && fieldlen >= 1) {
664 switch (*field) {
665 case 'S':
666 if (mod && (flags & T_MSS))
667 *mod = T_MSS;
668 if (fieldlen == 1)
669 return (0);
670 break;
671 case 'T':
672 if (mod && (flags & T_MTU))
673 *mod = T_MTU;
674 if (fieldlen == 1)
675 return (0);
676 break;
677 case '*':
678 if (fieldlen != 1) {
679 fprintf(stderr, "%s:%d long '%c' %s\n",
680 filename, lineno, *field, name);
681 return (1);
682 }
683 if (mod && (flags & T_DC)) {
684 *mod = T_DC;
685 return (0);
686 }
687 case '%':
688 if (mod && (flags & T_MOD))
689 *mod = T_MOD;
690 if (fieldlen == 1) {
691 fprintf(stderr, "%s:%d modulus %s must have a "
692 "value\n", filename, lineno, name);
693 return (1);
694 }
695 break;
696 }
697 if (mod == NULL || *mod == 0) {
698 fprintf(stderr, "%s:%d does not allow %c' %s\n",
699 filename, lineno, *field, name);
700 return (1);
701 }
702 i++;
703 }
704
705 for (; i < fieldlen; i++) {
706 if (field[i] < '0' || field[i] > '9') {
707 fprintf(stderr, "%s:%d non-digit character in %s\n",
708 filename, lineno, name);
709 return (1);
710 }
711 val = val * 10 + field[i] - '0';
712 if (val < 0) {
713 fprintf(stderr, "%s:%d %s overflowed\n", filename,
714 lineno, name);
715 return (1);
716 }
717 }
718
719 if (val > max) {
720 fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
721 name, val, max);
722 return (1);
723 }
724 *var = (int)val;
725
726 return (0);
727 }
728
729 /* parse the next string in a formatted config file line */
730 int
get_str(char ** line,size_t * len,char ** v,const char * name,int minlen,const char * filename,int lineno)731 get_str(char **line, size_t *len, char **v, const char *name, int minlen,
732 const char *filename, int lineno)
733 {
734 int fieldlen;
735 char *ptr;
736
737 ptr = get_field(line, len, &fieldlen);
738 if (ptr == NULL)
739 return (1);
740 if (fieldlen < minlen) {
741 fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
742 return (1);
743 }
744 if ((*v = malloc(fieldlen + 1)) == NULL) {
745 perror("malloc()");
746 return (1);
747 }
748 memcpy(*v, ptr, fieldlen);
749 (*v)[fieldlen] = '\0';
750
751 return (0);
752 }
753
754 /* Parse out the TCP opts */
755 int
get_tcpopts(const char * filename,int lineno,const char * tcpopts,pf_tcpopts_t * packed,int * optcnt,int * mss,int * mss_mod,int * wscale,int * wscale_mod,int * ts0)756 get_tcpopts(const char *filename, int lineno, const char *tcpopts,
757 pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
758 int *wscale_mod, int *ts0)
759 {
760 int i, opt;
761
762 *packed = 0;
763 *optcnt = 0;
764 *wscale = 0;
765 *wscale_mod = T_DC;
766 *mss = 0;
767 *mss_mod = T_DC;
768 *ts0 = 0;
769 if (strcmp(tcpopts, ".") == 0)
770 return (0);
771
772 for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
773 switch ((opt = toupper(tcpopts[i++]))) {
774 case 'N': /* FALLTHROUGH */
775 case 'S':
776 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
777 (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
778 PF_OSFP_TCPOPT_SACK);
779 break;
780 case 'W': /* FALLTHROUGH */
781 case 'M': {
782 int *this_mod, *this;
783
784 if (opt == 'W') {
785 this = wscale;
786 this_mod = wscale_mod;
787 } else {
788 this = mss;
789 this_mod = mss_mod;
790 }
791 *this = 0;
792 *this_mod = 0;
793
794 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
795 (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
796 PF_OSFP_TCPOPT_MSS);
797 if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
798 tcpopts[i + 1] == ',')) {
799 *this_mod = T_DC;
800 i++;
801 break;
802 }
803
804 if (tcpopts[i] == '%') {
805 *this_mod = T_MOD;
806 i++;
807 }
808 do {
809 if (!isdigit(tcpopts[i])) {
810 fprintf(stderr, "%s:%d unknown "
811 "character '%c' in %c TCP opt\n",
812 filename, lineno, tcpopts[i], opt);
813 return (1);
814 }
815 *this = (*this * 10) + tcpopts[i++] - '0';
816 } while(tcpopts[i] != ',' && tcpopts[i] != '\0');
817 break;
818 }
819 case 'T':
820 if (tcpopts[i] == '0') {
821 *ts0 = 1;
822 i++;
823 }
824 *packed = (*packed << PF_OSFP_TCPOPT_BITS) |
825 PF_OSFP_TCPOPT_TS;
826 break;
827 }
828 (*optcnt) ++;
829 if (tcpopts[i] == '\0')
830 break;
831 if (tcpopts[i] != ',') {
832 fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
833 filename, lineno, opt);
834 return (1);
835 }
836 i++;
837 }
838
839 return (0);
840 }
841
842 /* rip the next field ouf of a formatted config file line */
843 char *
get_field(char ** line,size_t * len,int * fieldlen)844 get_field(char **line, size_t *len, int *fieldlen)
845 {
846 char *ret, *ptr = *line;
847 size_t plen = *len;
848
849
850 while (plen && isspace(*ptr)) {
851 plen--;
852 ptr++;
853 }
854 ret = ptr;
855 *fieldlen = 0;
856
857 for (; plen > 0 && *ptr != ':'; plen--, ptr++)
858 (*fieldlen)++;
859 if (plen) {
860 *line = ptr + 1;
861 *len = plen - 1;
862 } else {
863 *len = 0;
864 }
865 while (*fieldlen && isspace(ret[*fieldlen - 1]))
866 (*fieldlen)--;
867 return (ret);
868 }
869
870
871 const char *
print_ioctl(struct pf_osfp_ioctl * fp)872 print_ioctl(struct pf_osfp_ioctl *fp)
873 {
874 static char buf[1024];
875 char tmp[32];
876 int i, opt;
877
878 *buf = '\0';
879 if (fp->fp_flags & PF_OSFP_WSIZE_DC)
880 strlcat(buf, "*", sizeof(buf));
881 else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
882 strlcat(buf, "S", sizeof(buf));
883 else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
884 strlcat(buf, "T", sizeof(buf));
885 else {
886 if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
887 strlcat(buf, "%", sizeof(buf));
888 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
889 strlcat(buf, tmp, sizeof(buf));
890 }
891 strlcat(buf, ":", sizeof(buf));
892
893 snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
894 strlcat(buf, tmp, sizeof(buf));
895 strlcat(buf, ":", sizeof(buf));
896
897 if (fp->fp_flags & PF_OSFP_DF)
898 strlcat(buf, "1", sizeof(buf));
899 else
900 strlcat(buf, "0", sizeof(buf));
901 strlcat(buf, ":", sizeof(buf));
902
903 if (fp->fp_flags & PF_OSFP_PSIZE_DC)
904 strlcat(buf, "*", sizeof(buf));
905 else {
906 if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
907 strlcat(buf, "%", sizeof(buf));
908 snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
909 strlcat(buf, tmp, sizeof(buf));
910 }
911 strlcat(buf, ":", sizeof(buf));
912
913 if (fp->fp_optcnt == 0)
914 strlcat(buf, ".", sizeof(buf));
915 for (i = fp->fp_optcnt - 1; i >= 0; i--) {
916 opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
917 opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
918 switch (opt) {
919 case PF_OSFP_TCPOPT_NOP:
920 strlcat(buf, "N", sizeof(buf));
921 break;
922 case PF_OSFP_TCPOPT_SACK:
923 strlcat(buf, "S", sizeof(buf));
924 break;
925 case PF_OSFP_TCPOPT_TS:
926 strlcat(buf, "T", sizeof(buf));
927 if (fp->fp_flags & PF_OSFP_TS0)
928 strlcat(buf, "0", sizeof(buf));
929 break;
930 case PF_OSFP_TCPOPT_MSS:
931 strlcat(buf, "M", sizeof(buf));
932 if (fp->fp_flags & PF_OSFP_MSS_DC)
933 strlcat(buf, "*", sizeof(buf));
934 else {
935 if (fp->fp_flags & PF_OSFP_MSS_MOD)
936 strlcat(buf, "%", sizeof(buf));
937 snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
938 strlcat(buf, tmp, sizeof(buf));
939 }
940 break;
941 case PF_OSFP_TCPOPT_WSCALE:
942 strlcat(buf, "W", sizeof(buf));
943 if (fp->fp_flags & PF_OSFP_WSCALE_DC)
944 strlcat(buf, "*", sizeof(buf));
945 else {
946 if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
947 strlcat(buf, "%", sizeof(buf));
948 snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
949 strlcat(buf, tmp, sizeof(buf));
950 }
951 break;
952 }
953
954 if (i != 0)
955 strlcat(buf, ",", sizeof(buf));
956 }
957 strlcat(buf, ":", sizeof(buf));
958
959 strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
960 strlcat(buf, ":", sizeof(buf));
961 strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
962 strlcat(buf, ":", sizeof(buf));
963 strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
964 strlcat(buf, ":", sizeof(buf));
965
966 snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
967 (long long int)fp->fp_tcpopts);
968 strlcat(buf, tmp, sizeof(buf));
969
970 return (buf);
971 }
972