Context Navigation

source: rtems-libbsd/freebsd/contrib/pf/pfctl/pfctl_osfp.c @ 084d4db

4.11

Last change on this file since 084d4db was 084d4db, checked in by Christian Mauderer <Christian.Mauderer@…>, on 07/05/16 at 14:07:37
pfctl: Import sources from FreeBSD.
Property mode set to `100644`
File size: 26.6 KB

Line
1	#include <machine/rtems-bsd-user-space.h>
2
3	/* $OpenBSD: pfctl_osfp.c,v 1.14 2006/04/08 02:13:14 ray Exp $ */
4
5	/*
6	* Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org>
7	*
8	* Permission to use, copy, modify, and distribute this software for any
9	* purpose with or without fee is hereby granted, provided that the above
10	* copyright notice and this permission notice appear in all copies.
11	*
12	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
19	*/
20
21	#include <rtems/bsd/sys/types.h>
22	#include <sys/ioctl.h>
23	#include <sys/socket.h>
24
25	#include <net/if.h>
26	#include <net/pfvar.h>
27
28	#include <netinet/in_systm.h>
29	#include <netinet/ip.h>
30	#include <netinet/ip6.h>
31
32	#include <ctype.h>
33	#include <err.h>
34	#include <errno.h>
35	#include <stdio.h>
36	#include <stdlib.h>
37	#include <string.h>
38
39	#include "pfctl_parser.h"
40	#include "pfctl.h"
41
42	#ifndef MIN
43	# define MIN(a,b) (((a) < (b)) ? (a) : (b))
44	#endif /* MIN */
45	#ifndef MAX
46	# define MAX(a,b) (((a) > (b)) ? (a) : (b))
47	#endif /* MAX */
48
49
50	#if 0
51	# define DEBUG(fp, str, v...) \
52	fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
53	(fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
54	#else
55	# define DEBUG(fp, str, v...) ((void)0)
56	#endif
57
58
59	struct name_entry;
60	LIST_HEAD(name_list, name_entry);
61	struct name_entry {
62	LIST_ENTRY(name_entry) nm_entry;
63	int nm_num;
64	char nm_name[PF_OSFP_LEN];
65
66	struct name_list nm_sublist;
67	int nm_sublist_num;
68	};
69	struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
70	int class_count;
71	int fingerprint_count;
72
73	void add_fingerprint(int, int, struct pf_osfp_ioctl *);
74	struct name_entry fingerprint_name_entry(struct name_list , char *);
75	void pfctl_flush_my_fingerprints(struct name_list *);
76	char get_field(char , size_t , int *);
77	int get_int(char *, size_t , int , int , const char *,
78	int, int, const char *, int);
79	int get_str(char *, size_t , char *, const char , int,
80	const char *, int);
81	int get_tcpopts(const char , int, const char ,
82	pf_tcpopts_t , int , int , int , int , int ,
83	int *);
84	void import_fingerprint(struct pf_osfp_ioctl *);
85	const char print_ioctl(struct pf_osfp_ioctl );
86	void print_name_list(int, struct name_list , const char );
87	void sort_name_list(int, struct name_list *);
88	struct name_entry lookup_name_list(struct name_list , const char *);
89
90	/* Load fingerprints from a file */
91	int
92	pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
93	{
94	FILE *in;
95	char *line;
96	size_t len;
97	int i, lineno = 0;
98	int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
99	wscale_mod, optcnt, ts0;
100	pf_tcpopts_t packed_tcpopts;
101	char class, version, subtype, desc, *tcpopts;
102	struct pf_osfp_ioctl fp;
103
104	pfctl_flush_my_fingerprints(&classes);
105
106	if ((in = pfctl_fopen(fp_filename, "r")) == NULL) {
107	warn("%s", fp_filename);
108	return (1);
109	}
110	class = version = subtype = desc = tcpopts = NULL;
111
112	if ((opts & PF_OPT_NOACTION) == 0)
113	pfctl_clear_fingerprints(dev, opts);
114
115	while ((line = fgetln(in, &len)) != NULL) {
116	lineno++;
117	if (class)
118	free(class);
119	if (version)
120	free(version);
121	if (subtype)
122	free(subtype);
123	if (desc)
124	free(desc);
125	if (tcpopts)
126	free(tcpopts);
127	class = version = subtype = desc = tcpopts = NULL;
128	memset(&fp, 0, sizeof(fp));
129
130	/* Chop off comment */
131	for (i = 0; i < len; i++)
132	if (line[i] == '#') {
133	len = i;
134	break;
135	}
136	/* Chop off whitespace */
137	while (len > 0 && isspace(line[len - 1]))
138	len--;
139	while (len > 0 && isspace(line[0])) {
140	len--;
141	line++;
142	}
143	if (len == 0)
144	continue;
145
146	#define T_DC 0x01 /* Allow don't care */
147	#define T_MSS 0x02 /* Allow MSS multiple */
148	#define T_MTU 0x04 /* Allow MTU multiple */
149	#define T_MOD 0x08 /* Allow modulus */
150
151	#define GET_INT(v, mod, n, ty, mx) \
152	get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
153	#define GET_STR(v, n, mn) \
154	get_str(&line, &len, &v, n, mn, fp_filename, lineno)
155
156	if (GET_INT(window, &w_mod, "window size", T_DC\|T_MSS\|T_MTU\|
157	T_MOD, 0xffff) \|\|
158	GET_INT(ttl, NULL, "ttl", 0, 0xff) \|\|
159	GET_INT(df, NULL, "don't fragment frag", 0, 1) \|\|
160	GET_INT(psize, &p_mod, "overall packet size", T_MOD\|T_DC,
161	8192) \|\|
162	GET_STR(tcpopts, "TCP Options", 1) \|\|
163	GET_STR(class, "OS class", 1) \|\|
164	GET_STR(version, "OS version", 0) \|\|
165	GET_STR(subtype, "OS subtype", 0) \|\|
166	GET_STR(desc, "OS description", 2))
167	continue;
168	if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
169	&optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
170	continue;
171	if (len != 0) {
172	fprintf(stderr, "%s:%d excess field\n", fp_filename,
173	lineno);
174	continue;
175	}
176
177	fp.fp_ttl = ttl;
178	if (df)
179	fp.fp_flags \|= PF_OSFP_DF;
180	switch (w_mod) {
181	case 0:
182	break;
183	case T_DC:
184	fp.fp_flags \|= PF_OSFP_WSIZE_DC;
185	break;
186	case T_MSS:
187	fp.fp_flags \|= PF_OSFP_WSIZE_MSS;
188	break;
189	case T_MTU:
190	fp.fp_flags \|= PF_OSFP_WSIZE_MTU;
191	break;
192	case T_MOD:
193	fp.fp_flags \|= PF_OSFP_WSIZE_MOD;
194	break;
195	}
196	fp.fp_wsize = window;
197
198	switch (p_mod) {
199	case T_DC:
200	fp.fp_flags \|= PF_OSFP_PSIZE_DC;
201	break;
202	case T_MOD:
203	fp.fp_flags \|= PF_OSFP_PSIZE_MOD;
204	}
205	fp.fp_psize = psize;
206
207
208	switch (wscale_mod) {
209	case T_DC:
210	fp.fp_flags \|= PF_OSFP_WSCALE_DC;
211	break;
212	case T_MOD:
213	fp.fp_flags \|= PF_OSFP_WSCALE_MOD;
214	}
215	fp.fp_wscale = wscale;
216
217	switch (mss_mod) {
218	case T_DC:
219	fp.fp_flags \|= PF_OSFP_MSS_DC;
220	break;
221	case T_MOD:
222	fp.fp_flags \|= PF_OSFP_MSS_MOD;
223	break;
224	}
225	fp.fp_mss = mss;
226
227	fp.fp_tcpopts = packed_tcpopts;
228	fp.fp_optcnt = optcnt;
229	if (ts0)
230	fp.fp_flags \|= PF_OSFP_TS0;
231
232	if (class[0] == '@')
233	fp.fp_os.fp_enflags \|= PF_OSFP_GENERIC;
234	if (class[0] == '*')
235	fp.fp_os.fp_enflags \|= PF_OSFP_NODETAIL;
236
237	if (class[0] == '@' \|\| class[0] == '*')
238	strlcpy(fp.fp_os.fp_class_nm, class + 1,
239	sizeof(fp.fp_os.fp_class_nm));
240	else
241	strlcpy(fp.fp_os.fp_class_nm, class,
242	sizeof(fp.fp_os.fp_class_nm));
243	strlcpy(fp.fp_os.fp_version_nm, version,
244	sizeof(fp.fp_os.fp_version_nm));
245	strlcpy(fp.fp_os.fp_subtype_nm, subtype,
246	sizeof(fp.fp_os.fp_subtype_nm));
247
248	add_fingerprint(dev, opts, &fp);
249
250	fp.fp_flags \|= (PF_OSFP_DF \| PF_OSFP_INET6);
251	fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip);
252	add_fingerprint(dev, opts, &fp);
253	}
254
255	if (class)
256	free(class);
257	if (version)
258	free(version);
259	if (subtype)
260	free(subtype);
261	if (desc)
262	free(desc);
263	if (tcpopts)
264	free(tcpopts);
265
266	fclose(in);
267
268	if (opts & PF_OPT_VERBOSE2)
269	printf("Loaded %d passive OS fingerprints\n",
270	fingerprint_count);
271	return (0);
272	}
273
274	/* flush the kernel's fingerprints */
275	void
276	pfctl_clear_fingerprints(int dev, int opts)
277	{
278	if (ioctl(dev, DIOCOSFPFLUSH))
279	err(1, "DIOCOSFPFLUSH");
280	}
281
282	/* flush pfctl's view of the fingerprints */
283	void
284	pfctl_flush_my_fingerprints(struct name_list *list)
285	{
286	struct name_entry *nm;
287
288	while ((nm = LIST_FIRST(list)) != NULL) {
289	LIST_REMOVE(nm, nm_entry);
290	pfctl_flush_my_fingerprints(&nm->nm_sublist);
291	free(nm);
292	}
293	fingerprint_count = 0;
294	class_count = 0;
295	}
296
297	/* Fetch the active fingerprints from the kernel */
298	int
299	pfctl_load_fingerprints(int dev, int opts)
300	{
301	struct pf_osfp_ioctl io;
302	int i;
303
304	pfctl_flush_my_fingerprints(&classes);
305
306	for (i = 0; i >= 0; i++) {
307	memset(&io, 0, sizeof(io));
308	io.fp_getnum = i;
309	if (ioctl(dev, DIOCOSFPGET, &io)) {
310	if (errno == EBUSY)
311	break;
312	warn("DIOCOSFPGET");
313	return (1);
314	}
315	import_fingerprint(&io);
316	}
317	return (0);
318	}
319
320	/* List the fingerprints */
321	void
322	pfctl_show_fingerprints(int opts)
323	{
324	if (LIST_FIRST(&classes) != NULL) {
325	if (opts & PF_OPT_SHOWALL) {
326	pfctl_print_title("OS FINGERPRINTS:");
327	printf("%u fingerprints loaded\n", fingerprint_count);
328	} else {
329	printf("Class\tVersion\tSubtype(subversion)\n");
330	printf("-----\t-------\t-------------------\n");
331	sort_name_list(opts, &classes);
332	print_name_list(opts, &classes, "");
333	}
334	}
335	}
336
337	/* Lookup a fingerprint */
338	pf_osfp_t
339	pfctl_get_fingerprint(const char *name)
340	{
341	struct name_entry nm, class_nm, version_nm, subtype_nm;
342	pf_osfp_t ret = PF_OSFP_NOMATCH;
343	int class, version, subtype;
344	int unp_class, unp_version, unp_subtype;
345	int wr_len, version_len, subtype_len;
346	char ptr, wr_name;
347
348	if (strcasecmp(name, "unknown") == 0)
349	return (PF_OSFP_UNKNOWN);
350
351	/* Try most likely no version and no subtype */
352	if ((nm = lookup_name_list(&classes, name))) {
353	class = nm->nm_num;
354	version = PF_OSFP_ANY;
355	subtype = PF_OSFP_ANY;
356	goto found;
357	} else {
358
359	/* Chop it up into class/version/subtype */
360
361	if ((wr_name = strdup(name)) == NULL)
362	err(1, "malloc");
363	if ((ptr = strchr(wr_name, ' ')) == NULL) {
364	free(wr_name);
365	return (PF_OSFP_NOMATCH);
366	}
367	*ptr++ = '\0';
368
369	/* The class is easy to find since it is delimited by a space */
370	if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
371	free(wr_name);
372	return (PF_OSFP_NOMATCH);
373	}
374	class = class_nm->nm_num;
375
376	/* Try no subtype */
377	if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
378	{
379	version = version_nm->nm_num;
380	subtype = PF_OSFP_ANY;
381	free(wr_name);
382	goto found;
383	}
384
385
386	/*
387	* There must be a version and a subtype.
388	* We'll do some fuzzy matching to pick up things like:
389	* Linux 2.2.14 (version=2.2 subtype=14)
390	* FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
391	* Windows 2000 SP2 (version=2000 subtype=SP2)
392	*/
393	#define CONNECTOR(x) ((x) == '.' \|\| (x) == ' ' \|\| (x) == '\t' \|\| (x) == '-')
394	wr_len = strlen(ptr);
395	LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
396	version_len = strlen(version_nm->nm_name);
397	if (wr_len < version_len + 2 \|\|
398	!CONNECTOR(ptr[version_len]))
399	continue;
400	/* first part of the string must be version */
401	if (strncasecmp(ptr, version_nm->nm_name,
402	version_len))
403	continue;
404
405	LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
406	nm_entry) {
407	subtype_len = strlen(subtype_nm->nm_name);
408	if (wr_len != version_len + subtype_len + 1)
409	continue;
410
411	/* last part of the string must be subtype */
412	if (strcasecmp(&ptr[version_len+1],
413	subtype_nm->nm_name) != 0)
414	continue;
415
416	/* Found it!! */
417	version = version_nm->nm_num;
418	subtype = subtype_nm->nm_num;
419	free(wr_name);
420	goto found;
421	}
422	}
423
424	free(wr_name);
425	return (PF_OSFP_NOMATCH);
426	}
427
428	found:
429	PF_OSFP_PACK(ret, class, version, subtype);
430	if (ret != PF_OSFP_NOMATCH) {
431	PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
432	if (class != unp_class) {
433	fprintf(stderr, "warning: fingerprint table overflowed "
434	"classes\n");
435	return (PF_OSFP_NOMATCH);
436	}
437	if (version != unp_version) {
438	fprintf(stderr, "warning: fingerprint table overflowed "
439	"versions\n");
440	return (PF_OSFP_NOMATCH);
441	}
442	if (subtype != unp_subtype) {
443	fprintf(stderr, "warning: fingerprint table overflowed "
444	"subtypes\n");
445	return (PF_OSFP_NOMATCH);
446	}
447	}
448	if (ret == PF_OSFP_ANY) {
449	/* should never happen */
450	fprintf(stderr, "warning: fingerprint packed to 'any'\n");
451	return (PF_OSFP_NOMATCH);
452	}
453
454	return (ret);
455	}
456
457	/* Lookup a fingerprint name by ID */
458	char *
459	pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
460	{
461	int class, version, subtype;
462	struct name_list *list;
463	struct name_entry *nm;
464
465	char class_name, version_name, *subtype_name;
466	class_name = version_name = subtype_name = NULL;
467
468	if (fp == PF_OSFP_UNKNOWN) {
469	strlcpy(buf, "unknown", len);
470	return (buf);
471	}
472	if (fp == PF_OSFP_ANY) {
473	strlcpy(buf, "any", len);
474	return (buf);
475	}
476
477	PF_OSFP_UNPACK(fp, class, version, subtype);
478	if (class >= (1 << _FP_CLASS_BITS) \|\|
479	version >= (1 << _FP_VERSION_BITS) \|\|
480	subtype >= (1 << _FP_SUBTYPE_BITS)) {
481	warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
482	strlcpy(buf, "nomatch", len);
483	return (buf);
484	}
485
486	LIST_FOREACH(nm, &classes, nm_entry) {
487	if (nm->nm_num == class) {
488	class_name = nm->nm_name;
489	if (version == PF_OSFP_ANY)
490	goto found;
491	list = &nm->nm_sublist;
492	LIST_FOREACH(nm, list, nm_entry) {
493	if (nm->nm_num == version) {
494	version_name = nm->nm_name;
495	if (subtype == PF_OSFP_ANY)
496	goto found;
497	list = &nm->nm_sublist;
498	LIST_FOREACH(nm, list, nm_entry) {
499	if (nm->nm_num == subtype) {
500	subtype_name =
501	nm->nm_name;
502	goto found;
503	}
504	} /* foreach subtype */
505	strlcpy(buf, "nomatch", len);
506	return (buf);
507	}
508	} /* foreach version */
509	strlcpy(buf, "nomatch", len);
510	return (buf);
511	}
512	} /* foreach class */
513
514	strlcpy(buf, "nomatch", len);
515	return (buf);
516
517	found:
518	snprintf(buf, len, "%s", class_name);
519	if (version_name) {
520	strlcat(buf, " ", len);
521	strlcat(buf, version_name, len);
522	if (subtype_name) {
523	if (strchr(version_name, ' '))
524	strlcat(buf, " ", len);
525	else if (strchr(version_name, '.') &&
526	isdigit(*subtype_name))
527	strlcat(buf, ".", len);
528	else
529	strlcat(buf, " ", len);
530	strlcat(buf, subtype_name, len);
531	}
532	}
533	return (buf);
534	}
535
536	/* lookup a name in a list */
537	struct name_entry *
538	lookup_name_list(struct name_list list, const char name)
539	{
540	struct name_entry *nm;
541	LIST_FOREACH(nm, list, nm_entry)
542	if (strcasecmp(name, nm->nm_name) == 0)
543	return (nm);
544
545	return (NULL);
546	}
547
548
549	void
550	add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
551	{
552	struct pf_osfp_ioctl fptmp;
553	struct name_entry nm_class, nm_version, *nm_subtype;
554	int class, version, subtype;
555
556	/* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
557	#define EXPAND(field) do { \
558	int _dot = -1, _start = -1, _end = -1, _i = 0; \
559	/* pick major version out of #.# */ \
560	if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \
561	_dot = fp->field[_i] - '0'; \
562	_i += 2; \
563	} \
564	if (isdigit(fp->field[_i])) \
565	_start = fp->field[_i++] - '0'; \
566	else \
567	break; \
568	if (isdigit(fp->field[_i])) \
569	_start = (_start * 10) + fp->field[_i++] - '0'; \
570	if (fp->field[_i++] != '-') \
571	break; \
572	if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \
573	fp->field[_i] - '0' == _dot) \
574	_i += 2; \
575	else if (_dot != -1) \
576	break; \
577	if (isdigit(fp->field[_i])) \
578	_end = fp->field[_i++] - '0'; \
579	else \
580	break; \
581	if (isdigit(fp->field[_i])) \
582	_end = (_end * 10) + fp->field[_i++] - '0'; \
583	if (isdigit(fp->field[_i])) \
584	_end = (_end * 10) + fp->field[_i++] - '0'; \
585	if (fp->field[_i] != '\0') \
586	break; \
587	memcpy(&fptmp, fp, sizeof(fptmp)); \
588	for (;_start <= _end; _start++) { \
589	memset(fptmp.field, 0, sizeof(fptmp.field)); \
590	fptmp.fp_os.fp_enflags \|= PF_OSFP_EXPANDED; \
591	if (_dot == -1) \
592	snprintf(fptmp.field, sizeof(fptmp.field), \
593	"%d", _start); \
594	else \
595	snprintf(fptmp.field, sizeof(fptmp.field), \
596	"%d.%d", _dot, _start); \
597	add_fingerprint(dev, opts, &fptmp); \
598	} \
599	} while(0)
600
601	/* We allow "#-#" as a version or subtype and we'll expand it */
602	EXPAND(fp_os.fp_version_nm);
603	EXPAND(fp_os.fp_subtype_nm);
604
605	if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
606	errx(1, "fingerprint class \"nomatch\" is reserved");
607
608	version = PF_OSFP_ANY;
609	subtype = PF_OSFP_ANY;
610
611	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
612	if (nm_class->nm_num == 0)
613	nm_class->nm_num = ++class_count;
614	class = nm_class->nm_num;
615
616	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
617	fp->fp_os.fp_version_nm);
618	if (nm_version) {
619	if (nm_version->nm_num == 0)
620	nm_version->nm_num = ++nm_class->nm_sublist_num;
621	version = nm_version->nm_num;
622	nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
623	fp->fp_os.fp_subtype_nm);
624	if (nm_subtype) {
625	if (nm_subtype->nm_num == 0)
626	nm_subtype->nm_num =
627	++nm_version->nm_sublist_num;
628	subtype = nm_subtype->nm_num;
629	}
630	}
631
632
633	DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
634	print_ioctl(fp));
635
636	PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
637	fingerprint_count++;
638
639	#ifdef FAKE_PF_KERNEL
640	/* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */
641	if ((errno = pf_osfp_add(fp)))
642	#else
643	if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
644	#endif /* FAKE_PF_KERNEL */
645	{
646	if (errno == EEXIST) {
647	warn("Duplicate signature for %s %s %s",
648	fp->fp_os.fp_class_nm,
649	fp->fp_os.fp_version_nm,
650	fp->fp_os.fp_subtype_nm);
651
652	} else {
653	err(1, "DIOCOSFPADD");
654	}
655	}
656	}
657
658	/* import a fingerprint from the kernel */
659	void
660	import_fingerprint(struct pf_osfp_ioctl *fp)
661	{
662	struct name_entry nm_class, nm_version, *nm_subtype;
663	int class, version, subtype;
664
665	PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
666
667	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
668	if (nm_class->nm_num == 0) {
669	nm_class->nm_num = class;
670	class_count = MAX(class_count, class);
671	}
672
673	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
674	fp->fp_os.fp_version_nm);
675	if (nm_version) {
676	if (nm_version->nm_num == 0) {
677	nm_version->nm_num = version;
678	nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
679	version);
680	}
681	nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
682	fp->fp_os.fp_subtype_nm);
683	if (nm_subtype) {
684	if (nm_subtype->nm_num == 0) {
685	nm_subtype->nm_num = subtype;
686	nm_version->nm_sublist_num =
687	MAX(nm_version->nm_sublist_num, subtype);
688	}
689	}
690	}
691
692
693	fingerprint_count++;
694	DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
695	}
696
697	/* Find an entry for a fingerprints class/version/subtype */
698	struct name_entry *
699	fingerprint_name_entry(struct name_list list, char name)
700	{
701	struct name_entry *nm_entry;
702
703	if (name == NULL \|\| strlen(name) == 0)
704	return (NULL);
705
706	LIST_FOREACH(nm_entry, list, nm_entry) {
707	if (strcasecmp(nm_entry->nm_name, name) == 0) {
708	/* We'll move this to the front of the list later */
709	LIST_REMOVE(nm_entry, nm_entry);
710	break;
711	}
712	}
713	if (nm_entry == NULL) {
714	nm_entry = calloc(1, sizeof(*nm_entry));
715	if (nm_entry == NULL)
716	err(1, "calloc");
717	LIST_INIT(&nm_entry->nm_sublist);
718	strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
719	}
720	LIST_INSERT_HEAD(list, nm_entry, nm_entry);
721	return (nm_entry);
722	}
723
724
725	void
726	print_name_list(int opts, struct name_list nml, const char prefix)
727	{
728	char newprefix[32];
729	struct name_entry *nm;
730
731	LIST_FOREACH(nm, nml, nm_entry) {
732	snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
733	nm->nm_name);
734	printf("%s\n", newprefix);
735	print_name_list(opts, &nm->nm_sublist, newprefix);
736	}
737	}
738
739	void
740	sort_name_list(int opts, struct name_list *nml)
741	{
742	struct name_list new;
743	struct name_entry nm, nmsearch, *nmlast;
744
745	/* yes yes, it's a very slow sort. so sue me */
746
747	LIST_INIT(&new);
748
749	while ((nm = LIST_FIRST(nml)) != NULL) {
750	LIST_REMOVE(nm, nm_entry);
751	nmlast = NULL;
752	LIST_FOREACH(nmsearch, &new, nm_entry) {
753	if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
754	LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
755	break;
756	}
757	nmlast = nmsearch;
758	}
759	if (nmsearch == NULL) {
760	if (nmlast)
761	LIST_INSERT_AFTER(nmlast, nm, nm_entry);
762	else
763	LIST_INSERT_HEAD(&new, nm, nm_entry);
764	}
765
766	sort_name_list(opts, &nm->nm_sublist);
767	}
768	nmlast = NULL;
769	while ((nm = LIST_FIRST(&new)) != NULL) {
770	LIST_REMOVE(nm, nm_entry);
771	if (nmlast == NULL)
772	LIST_INSERT_HEAD(nml, nm, nm_entry);
773	else
774	LIST_INSERT_AFTER(nmlast, nm, nm_entry);
775	nmlast = nm;
776	}
777	}
778
779	/* parse the next integer in a formatted config file line */
780	int
781	get_int(char *line, size_t len, int var, int mod,
782	const char name, int flags, int max, const char filename, int lineno)
783	{
784	int fieldlen, i;
785	char *field;
786	long val = 0;
787
788	if (mod)
789	*mod = 0;
790	*var = 0;
791
792	field = get_field(line, len, &fieldlen);
793	if (field == NULL)
794	return (1);
795	if (fieldlen == 0) {
796	fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
797	return (1);
798	}
799
800	i = 0;
801	if ((field == '%' \|\| field == 'S' \|\| field == 'T' \|\| field == '*')
802	&& fieldlen >= 1) {
803	switch (*field) {
804	case 'S':
805	if (mod && (flags & T_MSS))
806	*mod = T_MSS;
807	if (fieldlen == 1)
808	return (0);
809	break;
810	case 'T':
811	if (mod && (flags & T_MTU))
812	*mod = T_MTU;
813	if (fieldlen == 1)
814	return (0);
815	break;
816	case '*':
817	if (fieldlen != 1) {
818	fprintf(stderr, "%s:%d long '%c' %s\n",
819	filename, lineno, *field, name);
820	return (1);
821	}
822	if (mod && (flags & T_DC)) {
823	*mod = T_DC;
824	return (0);
825	}
826	case '%':
827	if (mod && (flags & T_MOD))
828	*mod = T_MOD;
829	if (fieldlen == 1) {
830	fprintf(stderr, "%s:%d modulus %s must have a "
831	"value\n", filename, lineno, name);
832	return (1);
833	}
834	break;
835	}
836	if (mod == NULL \|\| *mod == 0) {
837	fprintf(stderr, "%s:%d does not allow %c' %s\n",
838	filename, lineno, *field, name);
839	return (1);
840	}
841	i++;
842	}
843
844	for (; i < fieldlen; i++) {
845	if (field[i] < '0' \|\| field[i] > '9') {
846	fprintf(stderr, "%s:%d non-digit character in %s\n",
847	filename, lineno, name);
848	return (1);
849	}
850	val = val * 10 + field[i] - '0';
851	if (val < 0) {
852	fprintf(stderr, "%s:%d %s overflowed\n", filename,
853	lineno, name);
854	return (1);
855	}
856	}
857
858	if (val > max) {
859	fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
860	name, val, max);
861	return (1);
862	}
863	*var = (int)val;
864
865	return (0);
866	}
867
868	/* parse the next string in a formatted config file line */
869	int
870	get_str(char *line, size_t len, char *v, const char name, int minlen,
871	const char *filename, int lineno)
872	{
873	int fieldlen;
874	char *ptr;
875
876	ptr = get_field(line, len, &fieldlen);
877	if (ptr == NULL)
878	return (1);
879	if (fieldlen < minlen) {
880	fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
881	return (1);
882	}
883	if ((*v = malloc(fieldlen + 1)) == NULL) {
884	perror("malloc()");
885	return (1);
886	}
887	memcpy(*v, ptr, fieldlen);
888	(*v)[fieldlen] = '\0';
889
890	return (0);
891	}
892
893	/* Parse out the TCP opts */
894	int
895	get_tcpopts(const char filename, int lineno, const char tcpopts,
896	pf_tcpopts_t packed, int optcnt, int mss, int mss_mod, int *wscale,
897	int wscale_mod, int ts0)
898	{
899	int i, opt;
900
901	*packed = 0;
902	*optcnt = 0;
903	*wscale = 0;
904	*wscale_mod = T_DC;
905	*mss = 0;
906	*mss_mod = T_DC;
907	*ts0 = 0;
908	if (strcmp(tcpopts, ".") == 0)
909	return (0);
910
911	for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
912	switch ((opt = toupper(tcpopts[i++]))) {
913	case 'N': /* FALLTHROUGH */
914	case 'S':
915	packed = (packed << PF_OSFP_TCPOPT_BITS) \|
916	(opt == 'N' ? PF_OSFP_TCPOPT_NOP :
917	PF_OSFP_TCPOPT_SACK);
918	break;
919	case 'W': /* FALLTHROUGH */
920	case 'M': {
921	int this_mod, this;
922
923	if (opt == 'W') {
924	this = wscale;
925	this_mod = wscale_mod;
926	} else {
927	this = mss;
928	this_mod = mss_mod;
929	}
930	*this = 0;
931	*this_mod = 0;
932
933	packed = (packed << PF_OSFP_TCPOPT_BITS) \|
934	(opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
935	PF_OSFP_TCPOPT_MSS);
936	if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' \|\|
937	tcpopts[i + 1] == ',')) {
938	*this_mod = T_DC;
939	i++;
940	break;
941	}
942
943	if (tcpopts[i] == '%') {
944	*this_mod = T_MOD;
945	i++;
946	}
947	do {
948	if (!isdigit(tcpopts[i])) {
949	fprintf(stderr, "%s:%d unknown "
950	"character '%c' in %c TCP opt\n",
951	filename, lineno, tcpopts[i], opt);
952	return (1);
953	}
954	this = (this * 10) + tcpopts[i++] - '0';
955	} while(tcpopts[i] != ',' && tcpopts[i] != '\0');
956	break;
957	}
958	case 'T':
959	if (tcpopts[i] == '0') {
960	*ts0 = 1;
961	i++;
962	}
963	packed = (packed << PF_OSFP_TCPOPT_BITS) \|
964	PF_OSFP_TCPOPT_TS;
965	break;
966	}
967	(*optcnt) ++;
968	if (tcpopts[i] == '\0')
969	break;
970	if (tcpopts[i] != ',') {
971	fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
972	filename, lineno, opt);
973	return (1);
974	}
975	i++;
976	}
977
978	return (0);
979	}
980
981	/* rip the next field ouf of a formatted config file line */
982	char *
983	get_field(char *line, size_t len, int *fieldlen)
984	{
985	char ret, ptr = *line;
986	size_t plen = *len;
987
988
989	while (plen && isspace(*ptr)) {
990	plen--;
991	ptr++;
992	}
993	ret = ptr;
994	*fieldlen = 0;
995
996	for (; plen > 0 && *ptr != ':'; plen--, ptr++)
997	(*fieldlen)++;
998	if (plen) {
999	*line = ptr + 1;
1000	*len = plen - 1;
1001	} else {
1002	*len = 0;
1003	}
1004	while (fieldlen && isspace(ret[fieldlen - 1]))
1005	(*fieldlen)--;
1006	return (ret);
1007	}
1008
1009
1010	const char *
1011	print_ioctl(struct pf_osfp_ioctl *fp)
1012	{
1013	static char buf[1024];
1014	char tmp[32];
1015	int i, opt;
1016
1017	*buf = '\0';
1018	if (fp->fp_flags & PF_OSFP_WSIZE_DC)
1019	strlcat(buf, "*", sizeof(buf));
1020	else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
1021	strlcat(buf, "S", sizeof(buf));
1022	else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
1023	strlcat(buf, "T", sizeof(buf));
1024	else {
1025	if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
1026	strlcat(buf, "%", sizeof(buf));
1027	snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
1028	strlcat(buf, tmp, sizeof(buf));
1029	}
1030	strlcat(buf, ":", sizeof(buf));
1031
1032	snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
1033	strlcat(buf, tmp, sizeof(buf));
1034	strlcat(buf, ":", sizeof(buf));
1035
1036	if (fp->fp_flags & PF_OSFP_DF)
1037	strlcat(buf, "1", sizeof(buf));
1038	else
1039	strlcat(buf, "0", sizeof(buf));
1040	strlcat(buf, ":", sizeof(buf));
1041
1042	if (fp->fp_flags & PF_OSFP_PSIZE_DC)
1043	strlcat(buf, "*", sizeof(buf));
1044	else {
1045	if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
1046	strlcat(buf, "%", sizeof(buf));
1047	snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
1048	strlcat(buf, tmp, sizeof(buf));
1049	}
1050	strlcat(buf, ":", sizeof(buf));
1051
1052	if (fp->fp_optcnt == 0)
1053	strlcat(buf, ".", sizeof(buf));
1054	for (i = fp->fp_optcnt - 1; i >= 0; i--) {
1055	opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
1056	opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
1057	switch (opt) {
1058	case PF_OSFP_TCPOPT_NOP:
1059	strlcat(buf, "N", sizeof(buf));
1060	break;
1061	case PF_OSFP_TCPOPT_SACK:
1062	strlcat(buf, "S", sizeof(buf));
1063	break;
1064	case PF_OSFP_TCPOPT_TS:
1065	strlcat(buf, "T", sizeof(buf));
1066	if (fp->fp_flags & PF_OSFP_TS0)
1067	strlcat(buf, "0", sizeof(buf));
1068	break;
1069	case PF_OSFP_TCPOPT_MSS:
1070	strlcat(buf, "M", sizeof(buf));
1071	if (fp->fp_flags & PF_OSFP_MSS_DC)
1072	strlcat(buf, "*", sizeof(buf));
1073	else {
1074	if (fp->fp_flags & PF_OSFP_MSS_MOD)
1075	strlcat(buf, "%", sizeof(buf));
1076	snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
1077	strlcat(buf, tmp, sizeof(buf));
1078	}
1079	break;
1080	case PF_OSFP_TCPOPT_WSCALE:
1081	strlcat(buf, "W", sizeof(buf));
1082	if (fp->fp_flags & PF_OSFP_WSCALE_DC)
1083	strlcat(buf, "*", sizeof(buf));
1084	else {
1085	if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
1086	strlcat(buf, "%", sizeof(buf));
1087	snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
1088	strlcat(buf, tmp, sizeof(buf));
1089	}
1090	break;
1091	}
1092
1093	if (i != 0)
1094	strlcat(buf, ",", sizeof(buf));
1095	}
1096	strlcat(buf, ":", sizeof(buf));
1097
1098	strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
1099	strlcat(buf, ":", sizeof(buf));
1100	strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
1101	strlcat(buf, ":", sizeof(buf));
1102	strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
1103	strlcat(buf, ":", sizeof(buf));
1104
1105	snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
1106	(long long int)fp->fp_tcpopts);
1107	strlcat(buf, tmp, sizeof(buf));
1108
1109	return (buf);
1110	}

Note: See TracBrowser for help on using the repository browser.

Download in other formats: