pfctl_osfp.c revision 1.5 
1/*	$OpenBSD: pfctl_osfp.c,v 1.5 2004/01/29 01:25:13 mcbride Exp $ */
2
3/*
4 * Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#include <sys/types.h>
20#include <sys/ioctl.h>
21#include <sys/socket.h>
22
23#include <net/if.h>
24#include <net/pfvar.h>
25
26#include <ctype.h>
27#include <err.h>
28#include <errno.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32
33#include "pfctl_parser.h"
34#include "pfctl.h"
35
36#ifndef MIN
37# define MIN(a,b)	(((a) < (b)) ? (a) : (b))
38#endif /* MIN */
39#ifndef MAX
40# define MAX(a,b)	(((a) > (b)) ? (a) : (b))
41#endif /* MAX */
42
43
44#if 0
45# define DEBUG(fp, str, v...) \
46	fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
47	    (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
48#else
49# define DEBUG(fp, str, v...) ((void)0)
50#endif
51
52
53struct name_entry;
54LIST_HEAD(name_list, name_entry);
55struct name_entry {
56	LIST_ENTRY(name_entry)	nm_entry;
57	int			nm_num;
58	char			nm_name[PF_OSFP_LEN];
59
60	struct name_list	nm_sublist;
61	int			nm_sublist_num;
62};
63struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
64int class_count;
65int fingerprint_count;
66
67void			 add_fingerprint(int, int, struct pf_osfp_ioctl *);
68struct name_entry	*fingerprint_name_entry(struct name_list *, char *);
69void			 pfctl_flush_my_fingerprints(struct name_list *);
70char			*get_field(char **, size_t *, int *);
71int			 get_int(char **, size_t *, int *, int *, const char *,
72			     int, int, const char *, int);
73int			 get_str(char **, size_t *, char **, const char *, int,
74			     const char *, int);
75int			 get_tcpopts(const char *, int, const char *,
76			    pf_tcpopts_t *, int *, int *, int *, int *, int *,
77			    int *);
78void			 import_fingerprint(struct pf_osfp_ioctl *);
79const char		*print_ioctl(struct pf_osfp_ioctl *);
80void			 print_name_list(int, struct name_list *, const char *);
81void			 sort_name_list(int, struct name_list *);
82struct name_entry	*lookup_name_list(struct name_list *, const char *);
83
84/* Load fingerprints from a file */
85int
86pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
87{
88	FILE *in;
89	char *line;
90	size_t len;
91	int i, lineno = 0;
92	int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
93	    wscale_mod, optcnt, ts0;
94	pf_tcpopts_t packed_tcpopts;
95	char *class, *version, *subtype, *desc, *tcpopts;
96	struct pf_osfp_ioctl fp;
97
98	pfctl_flush_my_fingerprints(&classes);
99
100	if ((in = fopen(fp_filename, "r")) == NULL) {
101		warn("fopen(%s)", fp_filename);
102		return (1);
103	}
104	class = version = subtype = desc = tcpopts = NULL;
105
106	if ((opts & PF_OPT_NOACTION) == 0)
107		pfctl_clear_fingerprints(dev, opts);
108
109	while ((line = fgetln(in, &len)) != NULL) {
110		lineno++;
111		if (class)
112			free(class);
113		if (version)
114			free(version);
115		if (subtype)
116			free(subtype);
117		if (desc)
118			free(desc);
119		if (tcpopts)
120			free(tcpopts);
121		class = version = subtype = desc = tcpopts = NULL;
122		memset(&fp, 0, sizeof(fp));
123
124		/* Chop off comment */
125		for (i = 0; i < len; i++)
126			if (line[i] == '#') {
127				len = i;
128				break;
129			}
130		/* Chop off whitespace */
131		while (len > 0 && isspace(line[len - 1]))
132			len--;
133		while (len > 0 && isspace(line[0])) {
134			len--;
135			line++;
136		}
137		if (len == 0)
138			continue;
139
140#define T_DC	0x01	/* Allow don't care */
141#define T_MSS	0x02	/* Allow MSS multiple */
142#define T_MTU	0x04	/* Allow MTU multiple */
143#define T_MOD	0x08	/* Allow modulus */
144
145#define GET_INT(v, mod, n, ty, mx) \
146	get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
147#define GET_STR(v, n, mn) \
148	get_str(&line, &len, &v, n, mn, fp_filename, lineno)
149
150		if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
151		    T_MOD, 0xffff) ||
152		    GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
153		    GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
154		    GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
155		    8192) ||
156		    GET_STR(tcpopts, "TCP Options", 1) ||
157		    GET_STR(class, "OS class", 1) ||
158		    GET_STR(version, "OS version", 0) ||
159		    GET_STR(subtype, "OS subtype", 0) ||
160		    GET_STR(desc, "OS description", 2))
161			continue;
162		if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
163		    &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
164			continue;
165		if (len != 0) {
166			fprintf(stderr, "%s:%d excess field\n", fp_filename,
167			    lineno);
168			continue;
169		}
170
171		fp.fp_ttl = ttl;
172		if (df)
173			fp.fp_flags |= PF_OSFP_DF;
174		switch (w_mod) {
175		case 0:
176			break;
177		case T_DC:
178			fp.fp_flags |= PF_OSFP_WSIZE_DC;
179			break;
180		case T_MSS:
181			fp.fp_flags |= PF_OSFP_WSIZE_MSS;
182			break;
183		case T_MTU:
184			fp.fp_flags |= PF_OSFP_WSIZE_MTU;
185			break;
186		case T_MOD:
187			fp.fp_flags |= PF_OSFP_WSIZE_MOD;
188			break;
189		}
190		fp.fp_wsize = window;
191
192		switch (p_mod) {
193		case T_DC:
194			fp.fp_flags |= PF_OSFP_PSIZE_DC;
195			break;
196		case T_MOD:
197			fp.fp_flags |= PF_OSFP_PSIZE_MOD;
198		}
199		fp.fp_psize = psize;
200
201
202		switch (wscale_mod) {
203		case T_DC:
204			fp.fp_flags |= PF_OSFP_WSCALE_DC;
205			break;
206		case T_MOD:
207			fp.fp_flags |= PF_OSFP_WSCALE_MOD;
208		}
209		fp.fp_wscale = wscale;
210
211		switch (mss_mod) {
212		case T_DC:
213			fp.fp_flags |= PF_OSFP_MSS_DC;
214			break;
215		case T_MOD:
216			fp.fp_flags |= PF_OSFP_MSS_MOD;
217			break;
218		}
219		fp.fp_mss = mss;
220
221		fp.fp_tcpopts = packed_tcpopts;
222		fp.fp_optcnt = optcnt;
223		if (ts0)
224			fp.fp_flags |= PF_OSFP_TS0;
225
226		if (class[0] == '@')
227			fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
228		if (class[0] == '*')
229			fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
230
231		if (class[0] == '@' || class[0] == '*')
232			strlcpy(fp.fp_os.fp_class_nm, class + 1,
233			    sizeof(fp.fp_os.fp_class_nm));
234		else
235			strlcpy(fp.fp_os.fp_class_nm, class,
236			    sizeof(fp.fp_os.fp_class_nm));
237		strlcpy(fp.fp_os.fp_version_nm, version,
238		    sizeof(fp.fp_os.fp_version_nm));
239		strlcpy(fp.fp_os.fp_subtype_nm, subtype,
240		    sizeof(fp.fp_os.fp_subtype_nm));
241
242		add_fingerprint(dev, opts, &fp);
243	}
244
245	if (class)
246		free(class);
247	if (version)
248		free(version);
249	if (subtype)
250		free(subtype);
251	if (desc)
252		free(desc);
253
254	fclose(in);
255
256	if (opts & PF_OPT_VERBOSE2)
257		printf("Loaded %d passive OS fingerprints\n",
258		    fingerprint_count);
259	return (0);
260}
261
262/* flush the kernel's fingerprints */
263void
264pfctl_clear_fingerprints(int dev, int opts)
265{
266	if (ioctl(dev, DIOCOSFPFLUSH))
267		err(1, "DIOCOSFPFLUSH");
268}
269
270/* flush pfctl's view of the fingerprints */
271void
272pfctl_flush_my_fingerprints(struct name_list *list)
273{
274	struct name_entry *nm;
275
276	while ((nm = LIST_FIRST(list)) != NULL) {
277		LIST_REMOVE(nm, nm_entry);
278		pfctl_flush_my_fingerprints(&nm->nm_sublist);
279		fingerprint_count--;
280		free(nm);
281	}
282	class_count = 0;
283}
284
285/* Fetch the active fingerprints from the kernel */
286int
287pfctl_load_fingerprints(int dev, int opts)
288{
289	struct pf_osfp_ioctl io;
290	int i;
291
292	pfctl_flush_my_fingerprints(&classes);
293
294	for (i = 0; i >= 0; i++) {
295		memset(&io, 0, sizeof(io));
296		io.fp_getnum = i;
297		if (ioctl(dev, DIOCOSFPGET, &io)) {
298			if (errno == EBUSY)
299				break;
300			warn("DIOCOSFPGET");
301			return (1);
302		}
303		import_fingerprint(&io);
304	}
305	return (0);
306}
307
308/* List the fingerprints */
309void
310pfctl_show_fingerprints(int opts)
311{
312	if (LIST_FIRST(&classes) != NULL) {
313		if (opts & PF_OPT_SHOWALL)
314			pfctl_print_title("OS FINGERPRINTS:");
315
316		printf("Class\tVersion\tSubtype(subversion)\n");
317		printf("-----\t-------\t-------------------\n");
318		sort_name_list(opts, &classes);
319		print_name_list(opts, &classes, "");
320	}
321}
322
323/* Lookup a fingerprint */
324pf_osfp_t
325pfctl_get_fingerprint(const char *name)
326{
327	struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
328	pf_osfp_t ret = PF_OSFP_NOMATCH;
329	int class, version, subtype;
330	int unp_class, unp_version, unp_subtype;
331	int wr_len, version_len, subtype_len;
332	char *ptr, *wr_name;
333
334	if (strcasecmp(name, "unknown") == 0)
335		return (PF_OSFP_UNKNOWN);
336
337	/* Try most likely no version and no subtype */
338	if ((nm = lookup_name_list(&classes, name))) {
339		class = nm->nm_num;
340		version = PF_OSFP_ANY;
341		subtype = PF_OSFP_ANY;
342		goto found;
343	} else {
344
345		/* Chop it up into class/version/subtype */
346
347		if ((wr_name = strdup(name)) == NULL)
348			err(1, "malloc");
349		if ((ptr = index(wr_name, ' ')) == NULL) {
350			free(wr_name);
351			return (PF_OSFP_NOMATCH);
352		}
353		*ptr++ = '\0';
354
355		/* The class is easy to find since it is delimited by a space */
356		if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
357			free(wr_name);
358			return (PF_OSFP_NOMATCH);
359		}
360		class = class_nm->nm_num;
361
362		/* Try no subtype */
363		if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
364		{
365			version = version_nm->nm_num;
366			subtype = PF_OSFP_ANY;
367			free(wr_name);
368			goto found;
369		}
370
371
372		/*
373		 * There must be a version and a subtype.
374		 * We'll do some fuzzy matching to pick up things like:
375		 *   Linux 2.2.14 (version=2.2 subtype=14)
376		 *   FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
377		 *   Windows 2000 SP2	(version=2000 subtype=SP2)
378		 */
379#define CONNECTOR(x)	((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
380		wr_len = strlen(ptr);
381		LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
382			version_len = strlen(version_nm->nm_name);
383			if (wr_len < version_len + 2 ||
384			    !CONNECTOR(ptr[version_len]))
385				continue;
386			/* first part of the string must be version */
387			if (strncasecmp(ptr, version_nm->nm_name,
388			    version_len))
389				continue;
390
391			LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
392			    nm_entry) {
393				subtype_len = strlen(subtype_nm->nm_name);
394				if (wr_len != version_len + subtype_len + 1)
395					continue;
396
397				/* last part of the string must be subtype */
398				if (strcasecmp(&ptr[version_len+1],
399				    subtype_nm->nm_name) != 0)
400					continue;
401
402				/* Found it!! */
403				version = version_nm->nm_num;
404				subtype = subtype_nm->nm_num;
405				free(wr_name);
406				goto found;
407			}
408		}
409
410		free(wr_name);
411		return (PF_OSFP_NOMATCH);
412	}
413
414found:
415	PF_OSFP_PACK(ret, class, version, subtype);
416	if (ret != PF_OSFP_NOMATCH) {
417		PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
418		if (class != unp_class) {
419			fprintf(stderr, "warning: fingerprint table overflowed "
420			    "classes\n");
421			return (PF_OSFP_NOMATCH);
422		}
423		if (version != unp_version) {
424			fprintf(stderr, "warning: fingerprint table overflowed "
425			    "versions\n");
426			return (PF_OSFP_NOMATCH);
427		}
428		if (subtype != unp_subtype) {
429			fprintf(stderr, "warning: fingerprint table overflowed "
430			    "subtypes\n");
431			return (PF_OSFP_NOMATCH);
432		}
433	}
434	if (ret == PF_OSFP_ANY) {
435		/* should never happen */
436		fprintf(stderr, "warning: fingerprint packed to 'any'\n");
437		return (PF_OSFP_NOMATCH);
438	}
439
440	return (ret);
441}
442
443/* Lookup a fingerprint name by ID */
444char *
445pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
446{
447	int class, version, subtype;
448	struct name_list *list;
449	struct name_entry *nm;
450
451	char *class_name, *version_name, *subtype_name;
452	class_name = version_name = subtype_name = NULL;
453
454	if (fp == PF_OSFP_UNKNOWN) {
455		strlcpy(buf, "unknown", len);
456		return (buf);
457	}
458	if (fp == PF_OSFP_ANY) {
459		strlcpy(buf, "any", len);
460		return (buf);
461	}
462
463	PF_OSFP_UNPACK(fp, class, version, subtype);
464	if (class >= (1 << _FP_CLASS_BITS) ||
465	    version >= (1 << _FP_VERSION_BITS) ||
466	    subtype >= (1 << _FP_SUBTYPE_BITS)) {
467		warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
468		strlcpy(buf, "nomatch", len);
469		return (buf);
470	}
471
472	LIST_FOREACH(nm, &classes, nm_entry) {
473		if (nm->nm_num == class) {
474			class_name = nm->nm_name;
475			if (version == PF_OSFP_ANY)
476				goto found;
477			list = &nm->nm_sublist;
478			LIST_FOREACH(nm, list, nm_entry) {
479				if (nm->nm_num == version) {
480					version_name = nm->nm_name;
481					if (subtype == PF_OSFP_ANY)
482						goto found;
483					list = &nm->nm_sublist;
484					LIST_FOREACH(nm, list, nm_entry) {
485						if (nm->nm_num == subtype) {
486							subtype_name =
487							    nm->nm_name;
488							goto found;
489						}
490					} /* foreach subtype */
491					strlcpy(buf, "nomatch", len);
492					return (buf);
493				}
494			} /* foreach version */
495			strlcpy(buf, "nomatch", len);
496			return (buf);
497		}
498	} /* foreach class */
499
500	strlcpy(buf, "nomatch", len);
501	return (buf);
502
503found:
504	snprintf(buf, len, "%s", class_name);
505	if (version_name) {
506		strlcat(buf, " ", len);
507		strlcat(buf, version_name, len);
508		if (subtype_name) {
509			if (index(version_name, ' '))
510				strlcat(buf, " ", len);
511			else if (index(version_name, '.') &&
512			    isdigit(*subtype_name))
513				strlcat(buf, ".", len);
514			else
515				strlcat(buf, " ", len);
516			strlcat(buf, subtype_name, len);
517		}
518	}
519	return (buf);
520}
521
522/* lookup a name in a list */
523struct name_entry *
524lookup_name_list(struct name_list *list, const char *name)
525{
526	struct name_entry *nm;
527	LIST_FOREACH(nm, list, nm_entry)
528		if (strcasecmp(name, nm->nm_name) == 0)
529			return (nm);
530
531	return (NULL);
532}
533
534
535void
536add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
537{
538	struct pf_osfp_ioctl fptmp;
539	struct name_entry *nm_class, *nm_version, *nm_subtype;
540	int class, version, subtype;
541
542/* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
543#define EXPAND(field) do {						\
544	int _dot = -1, _start = -1, _end = -1, _i = 0;			\
545	/* pick major version out of #.# */				\
546	if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') {		\
547		_dot = fp->field[_i] - '0';				\
548		_i += 2;						\
549	}								\
550	if (isdigit(fp->field[_i]))					\
551		_start = fp->field[_i++] - '0';				\
552	else								\
553		break;							\
554	if (isdigit(fp->field[_i]))					\
555		_start = (_start * 10) + fp->field[_i++] - '0';		\
556	if (fp->field[_i++] != '-')					\
557		break;							\
558	if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' &&		\
559	    fp->field[_i] - '0' == _dot)				\
560		_i += 2;						\
561	else if (_dot != -1)						\
562		break;							\
563	if (isdigit(fp->field[_i]))					\
564		_end = fp->field[_i++] - '0';				\
565	else								\
566		break;							\
567	if (isdigit(fp->field[_i]))					\
568		_end = (_end * 10) + fp->field[_i++] - '0';		\
569	if (isdigit(fp->field[_i]))					\
570		_end = (_end * 10) + fp->field[_i++] - '0';		\
571	if (fp->field[_i] != '\0')					\
572		break;							\
573	memcpy(&fptmp, fp, sizeof(fptmp));				\
574	for (;_start <= _end; _start++) {				\
575		memset(fptmp.field, 0, sizeof(fptmp.field));		\
576		fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED;		\
577		if (_dot == -1)						\
578			snprintf(fptmp.field, sizeof(fptmp.field),	\
579			    "%d", _start);				\
580		    else						\
581			snprintf(fptmp.field, sizeof(fptmp.field),	\
582			    "%d.%d", _dot, _start);			\
583		add_fingerprint(dev, opts, &fptmp);			\
584	}								\
585} while(0)
586
587	/* We allow "#-#" as a version or subtype and we'll expand it */
588	EXPAND(fp_os.fp_version_nm);
589	EXPAND(fp_os.fp_subtype_nm);
590
591	if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
592		errx(1, "fingerprint class \"nomatch\" is reserved");
593
594	version = PF_OSFP_ANY;
595	subtype = PF_OSFP_ANY;
596
597	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
598	if (nm_class->nm_num == 0)
599		nm_class->nm_num = ++class_count;
600	class = nm_class->nm_num;
601
602	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
603	    fp->fp_os.fp_version_nm);
604	if (nm_version) {
605		if (nm_version->nm_num == 0)
606			nm_version->nm_num = ++nm_class->nm_sublist_num;
607		version = nm_version->nm_num;
608		nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
609		    fp->fp_os.fp_subtype_nm);
610		if (nm_subtype) {
611			if (nm_subtype->nm_num == 0)
612				nm_subtype->nm_num =
613				    ++nm_version->nm_sublist_num;
614			subtype = nm_subtype->nm_num;
615		}
616	}
617
618
619	DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
620	    print_ioctl(fp));
621
622	PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
623	fingerprint_count++;
624
625#ifdef FAKE_PF_KERNEL
626	/* Linked to the sys/net/pf_osfp.c.  Call pf_osfp_add() */
627	if ((errno = pf_osfp_add(fp)))
628#else
629	if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
630#endif /* FAKE_PF_KERNEL */
631	{
632		if (errno == EEXIST) {
633			warn("Duplicate signature for %s %s %s",
634				fp->fp_os.fp_class_nm,
635				fp->fp_os.fp_version_nm,
636				fp->fp_os.fp_subtype_nm);
637
638		} else {
639			err(1, "DIOCOSFPADD");
640		}
641	}
642}
643
644/* import a fingerprint from the kernel */
645void
646import_fingerprint(struct pf_osfp_ioctl *fp)
647{
648	struct name_entry *nm_class, *nm_version, *nm_subtype;
649	int class, version, subtype;
650
651	PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
652
653	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
654	if (nm_class->nm_num == 0) {
655		nm_class->nm_num = class;
656		class_count = MAX(class_count, class);
657	}
658
659	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
660	    fp->fp_os.fp_version_nm);
661	if (nm_version) {
662		if (nm_version->nm_num == 0) {
663			nm_version->nm_num = version;
664			nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
665			    version);
666		}
667		nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
668		    fp->fp_os.fp_subtype_nm);
669		if (nm_subtype) {
670			if (nm_subtype->nm_num == 0) {
671				nm_subtype->nm_num = subtype;
672				nm_version->nm_sublist_num =
673				    MAX(nm_version->nm_sublist_num, subtype);
674			}
675		}
676	}
677
678
679	fingerprint_count++;
680	DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
681}
682
683/* Find an entry for a fingerprints class/version/subtype */
684struct name_entry *
685fingerprint_name_entry(struct name_list *list, char *name)
686{
687	struct name_entry *nm_entry;
688
689	if (name == NULL || strlen(name) == 0)
690		return (NULL);
691
692	LIST_FOREACH(nm_entry, list, nm_entry) {
693		if (strcasecmp(nm_entry->nm_name, name) == 0) {
694			/* We'll move this to the front of the list later */
695			LIST_REMOVE(nm_entry, nm_entry);
696			break;
697		}
698	}
699	if (nm_entry == NULL) {
700		nm_entry = calloc(1, sizeof(*nm_entry));
701		if (nm_entry == NULL)
702			err(1, "calloc");
703			LIST_INIT(&nm_entry->nm_sublist);
704			strlcpy(nm_entry->nm_name, name,
705			    sizeof(nm_entry->nm_name));
706	}
707	LIST_INSERT_HEAD(list, nm_entry, nm_entry);
708	return (nm_entry);
709}
710
711
712void
713print_name_list(int opts, struct name_list *nml, const char *prefix)
714{
715	char newprefix[32];
716	struct name_entry *nm;
717
718	LIST_FOREACH(nm, nml, nm_entry) {
719		snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
720		    nm->nm_name);
721		printf("%s\n", newprefix);
722		print_name_list(opts, &nm->nm_sublist, newprefix);
723	}
724}
725
726void
727sort_name_list(int opts, struct name_list *nml)
728{
729	struct name_list new;
730	struct name_entry *nm, *nmsearch, *nmlast;
731
732	/* yes yes, it's a very slow sort.  so sue me */
733
734	LIST_INIT(&new);
735
736	while ((nm = LIST_FIRST(nml)) != NULL) {
737		LIST_REMOVE(nm, nm_entry);
738		nmlast = NULL;
739		LIST_FOREACH(nmsearch, &new, nm_entry) {
740			if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
741				LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
742				break;
743			}
744			nmlast = nmsearch;
745		}
746		if (nmsearch == NULL) {
747			if (nmlast)
748				LIST_INSERT_AFTER(nmlast, nm, nm_entry);
749			else
750				LIST_INSERT_HEAD(&new, nm, nm_entry);
751		}
752
753		sort_name_list(opts, &nm->nm_sublist);
754	}
755	nmlast = NULL;
756	while ((nm = LIST_FIRST(&new)) != NULL) {
757		LIST_REMOVE(nm, nm_entry);
758		if (nmlast == NULL)
759			LIST_INSERT_HEAD(nml, nm, nm_entry);
760		else
761			LIST_INSERT_AFTER(nmlast, nm, nm_entry);
762		nmlast = nm;
763	}
764	return;
765}
766
767/* parse the next integer in a formatted config file line */
768int
769get_int(char **line, size_t *len, int *var, int *mod,
770    const char *name, int flags, int max, const char *filename, int lineno)
771{
772	int fieldlen, i;
773	char *field;
774	long val = 0;
775
776	if (mod)
777		*mod = 0;
778	*var = 0;
779
780	field = get_field(line, len, &fieldlen);
781	if (field == NULL)
782		return (1);
783	if (fieldlen == 0) {
784		fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
785		return (1);
786	}
787
788	i = 0;
789	if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
790	    && fieldlen >= 1) {
791		switch (*field) {
792		case 'S':
793			if (mod && (flags & T_MSS))
794				*mod = T_MSS;
795			if (fieldlen == 1)
796				return (0);
797			break;
798		case 'T':
799			if (mod && (flags & T_MTU))
800				*mod = T_MTU;
801			if (fieldlen == 1)
802				return (0);
803			break;
804		case '*':
805			if (fieldlen != 1) {
806				fprintf(stderr, "%s:%d long '%c' %s\n",
807				    filename, lineno, *field, name);
808				return (1);
809			}
810			if (mod && (flags & T_DC)) {
811				*mod = T_DC;
812				return (0);
813			}
814		case '%':
815			if (mod && (flags & T_MOD))
816				*mod = T_MOD;
817			if (fieldlen == 1) {
818				fprintf(stderr, "%s:%d modulus %s must have a "
819				    "value\n", filename, lineno, name);
820				return (1);
821			}
822			break;
823		}
824		if (mod == NULL || *mod == 0) {
825			fprintf(stderr, "%s:%d does not allow %c' %s\n",
826			    filename, lineno, *field, name);
827			return (1);
828		}
829		i++;
830	}
831
832	for (; i < fieldlen; i++) {
833		if (field[i] < '0'  || field[i] > '9') {
834			fprintf(stderr, "%s:%d non-digit character in %s\n",
835			    filename, lineno, name);
836			return (1);
837		}
838		val = val * 10 + field[i] - '0';
839		if (val < 0) {
840			fprintf(stderr, "%s:%d %s overflowed\n", filename,
841			    lineno, name);
842			return (1);
843		}
844	}
845
846	if (val > max) {
847		fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
848		    name, val, max);
849		return (1);
850	}
851	*var = (int)val;
852
853	return (0);
854}
855
856/* parse the next string in a formatted config file line */
857int
858get_str(char **line, size_t *len, char **v, const char *name, int minlen,
859    const char *filename, int lineno)
860{
861	int fieldlen;
862	char *ptr;
863
864	ptr = get_field(line, len, &fieldlen);
865	if (ptr == NULL)
866		return (1);
867	if (fieldlen < minlen) {
868		fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
869		return (1);
870	}
871	if ((*v = malloc(fieldlen + 1)) == NULL) {
872		perror("malloc()");
873		return (1);
874	}
875	memcpy(*v, ptr, fieldlen);
876	(*v)[fieldlen] = '\0';
877
878	return (0);
879}
880
881/* Parse out the TCP opts */
882int
883get_tcpopts(const char *filename, int lineno, const char *tcpopts,
884    pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
885    int *wscale_mod, int *ts0)
886{
887	int i, opt;
888
889	*packed = 0;
890	*optcnt = 0;
891	*wscale = 0;
892	*wscale_mod = T_DC;
893	*mss = 0;
894	*mss_mod = T_DC;
895	*ts0 = 0;
896	if (strcmp(tcpopts, ".") == 0)
897		return (0);
898
899	for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
900		switch ((opt = toupper(tcpopts[i++]))) {
901		case 'N':	/* FALLTHROUGH */
902		case 'S':
903			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
904			    (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
905			    PF_OSFP_TCPOPT_SACK);
906			break;
907		case 'W':	/* FALLTHROUGH */
908		case 'M': {
909			int *this_mod, *this;
910
911			if (opt == 'W') {
912				this = wscale;
913				this_mod = wscale_mod;
914			} else {
915				this = mss;
916				this_mod = mss_mod;
917			}
918			*this = 0;
919			*this_mod = 0;
920
921			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
922			    (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
923			    PF_OSFP_TCPOPT_MSS);
924			if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
925			    tcpopts[i + 1] == ',')) {
926				*this_mod = T_DC;
927				i++;
928				break;
929			}
930
931			if (tcpopts[i] == '%') {
932				*this_mod = T_MOD;
933				i++;
934			}
935			do {
936				if (!isdigit(tcpopts[i])) {
937					fprintf(stderr, "%s:%d unknown "
938					    "character '%c' in %c TCP opt\n",
939					    filename, lineno, tcpopts[i], opt);
940					return (1);
941				}
942				*this = (*this * 10) + tcpopts[i++] - '0';
943			} while(tcpopts[i] != ',' && tcpopts[i] != '\0');
944			break;
945		}
946		case 'T':
947			if (tcpopts[i] == '0') {
948				*ts0 = 1;
949				i++;
950			}
951			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
952			    PF_OSFP_TCPOPT_TS;
953			break;
954		}
955		(*optcnt) ++;
956		if (tcpopts[i] == '\0')
957			break;
958		if (tcpopts[i] != ',') {
959			fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
960			    filename, lineno, opt);
961			return (1);
962		}
963		i++;
964	}
965
966	return (0);
967}
968
969/* rip the next field ouf of a formatted config file line */
970char *
971get_field(char **line, size_t *len, int *fieldlen)
972{
973	char *ret, *ptr = *line;
974	size_t plen = *len;
975
976
977	while (plen && isspace(*ptr)) {
978		plen--;
979		ptr++;
980	}
981	ret = ptr;
982	*fieldlen = 0;
983
984	for (; plen > 0 && *ptr != ':'; plen--, ptr++)
985		(*fieldlen)++;
986	if (plen) {
987		*line = ptr + 1;
988		*len = plen - 1;
989	} else {
990		*len = 0;
991	}
992	while (*fieldlen && isspace(ret[*fieldlen - 1]))
993		(*fieldlen)--;
994	return (ret);
995}
996
997
998const char *
999print_ioctl(struct pf_osfp_ioctl *fp)
1000{
1001	static char buf[1024];
1002	char tmp[32];
1003	int i, opt;
1004
1005	*buf = '\0';
1006	if (fp->fp_flags & PF_OSFP_WSIZE_DC)
1007		strlcat(buf, "*", sizeof(buf));
1008	else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
1009		strlcat(buf, "S", sizeof(buf));
1010	else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
1011		strlcat(buf, "T", sizeof(buf));
1012	else {
1013		if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
1014			strlcat(buf, "%", sizeof(buf));
1015		snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
1016		strlcat(buf, tmp, sizeof(buf));
1017	}
1018	strlcat(buf, ":", sizeof(buf));
1019
1020	snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
1021	strlcat(buf, tmp, sizeof(buf));
1022	strlcat(buf, ":", sizeof(buf));
1023
1024	if (fp->fp_flags & PF_OSFP_DF)
1025		strlcat(buf, "1", sizeof(buf));
1026	else
1027		strlcat(buf, "0", sizeof(buf));
1028	strlcat(buf, ":", sizeof(buf));
1029
1030	if (fp->fp_flags & PF_OSFP_PSIZE_DC)
1031		strlcat(buf, "*", sizeof(buf));
1032	else {
1033		if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
1034			strlcat(buf, "%", sizeof(buf));
1035		snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
1036		strlcat(buf, tmp, sizeof(buf));
1037	}
1038	strlcat(buf, ":", sizeof(buf));
1039
1040	if (fp->fp_optcnt == 0)
1041		strlcat(buf, ".", sizeof(buf));
1042	for (i = fp->fp_optcnt - 1; i >= 0; i--) {
1043		opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
1044		opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
1045		switch (opt) {
1046		case PF_OSFP_TCPOPT_NOP:
1047			strlcat(buf, "N", sizeof(buf));
1048			break;
1049		case PF_OSFP_TCPOPT_SACK:
1050			strlcat(buf, "S", sizeof(buf));
1051			break;
1052		case PF_OSFP_TCPOPT_TS:
1053			strlcat(buf, "T", sizeof(buf));
1054			if (fp->fp_flags & PF_OSFP_TS0)
1055				strlcat(buf, "0", sizeof(buf));
1056			break;
1057		case PF_OSFP_TCPOPT_MSS:
1058			strlcat(buf, "M", sizeof(buf));
1059			if (fp->fp_flags & PF_OSFP_MSS_DC)
1060				strlcat(buf, "*", sizeof(buf));
1061			else {
1062				if (fp->fp_flags & PF_OSFP_MSS_MOD)
1063					strlcat(buf, "%", sizeof(buf));
1064				snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
1065				strlcat(buf, tmp, sizeof(buf));
1066			}
1067			break;
1068		case PF_OSFP_TCPOPT_WSCALE:
1069			strlcat(buf, "W", sizeof(buf));
1070			if (fp->fp_flags & PF_OSFP_WSCALE_DC)
1071				strlcat(buf, "*", sizeof(buf));
1072			else {
1073				if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
1074					strlcat(buf, "%", sizeof(buf));
1075				snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
1076				strlcat(buf, tmp, sizeof(buf));
1077			}
1078			break;
1079		}
1080
1081		if (i != 0)
1082			strlcat(buf, ",", sizeof(buf));
1083	}
1084	strlcat(buf, ":", sizeof(buf));
1085
1086	strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
1087	strlcat(buf, ":", sizeof(buf));
1088	strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
1089	strlcat(buf, ":", sizeof(buf));
1090	strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
1091	strlcat(buf, ":", sizeof(buf));
1092
1093	snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
1094	    (long long int)fp->fp_tcpopts);
1095	strlcat(buf, tmp, sizeof(buf));
1096
1097	return (buf);
1098}
1099