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pfctl_osfp.c revision 1.2 
      1 /*	$NetBSD: pfctl_osfp.c,v 1.2 2004/06/22 15:16:30 itojun Exp $	*/
      2 /*	$OpenBSD: pfctl_osfp.c,v 1.8 2004/02/27 10:42:00 henning Exp $ */
      3 
      4 /*
      5  * Copyright (c) 2003 Mike Frantzen <frantzen (at) 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 #ifdef __NetBSD__
     25 #include <netinet/in.h>
     26 #endif
     27 
     28 #include <net/if.h>
     29 #include <net/pfvar.h>
     30 
     31 #include <ctype.h>
     32 #include <err.h>
     33 #include <errno.h>
     34 #include <stdio.h>
     35 #include <stdlib.h>
     36 #include <string.h>
     37 
     38 #include "pfctl_parser.h"
     39 #include "pfctl.h"
     40 
     41 #ifndef MIN
     42 # define MIN(a,b)	(((a) < (b)) ? (a) : (b))
     43 #endif /* MIN */
     44 #ifndef MAX
     45 # define MAX(a,b)	(((a) > (b)) ? (a) : (b))
     46 #endif /* MAX */
     47 
     48 
     49 #if 0
     50 # define DEBUG(fp, str, v...) \
     51 	fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
     52 	    (fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
     53 #else
     54 # define DEBUG(fp, str, v...) ((void)0)
     55 #endif
     56 
     57 
     58 struct name_entry;
     59 LIST_HEAD(name_list, name_entry);
     60 struct name_entry {
     61 	LIST_ENTRY(name_entry)	nm_entry;
     62 	int			nm_num;
     63 	char			nm_name[PF_OSFP_LEN];
     64 
     65 	struct name_list	nm_sublist;
     66 	int			nm_sublist_num;
     67 };
     68 struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
     69 int class_count;
     70 int fingerprint_count;
     71 
     72 void			 add_fingerprint(int, int, struct pf_osfp_ioctl *);
     73 struct name_entry	*fingerprint_name_entry(struct name_list *, char *);
     74 void			 pfctl_flush_my_fingerprints(struct name_list *);
     75 char			*get_field(char **, size_t *, int *);
     76 int			 get_int(char **, size_t *, int *, int *, const char *,
     77 			     int, int, const char *, int);
     78 int			 get_str(char **, size_t *, char **, const char *, int,
     79 			     const char *, int);
     80 int			 get_tcpopts(const char *, int, const char *,
     81 			    pf_tcpopts_t *, int *, int *, int *, int *, int *,
     82 			    int *);
     83 void			 import_fingerprint(struct pf_osfp_ioctl *);
     84 const char		*print_ioctl(struct pf_osfp_ioctl *);
     85 void			 print_name_list(int, struct name_list *, const char *);
     86 void			 sort_name_list(int, struct name_list *);
     87 struct name_entry	*lookup_name_list(struct name_list *, const char *);
     88 
     89 /* Load fingerprints from a file */
     90 int
     91 pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
     92 {
     93 	FILE *in;
     94 	char *line;
     95 	size_t len;
     96 	int i, lineno = 0;
     97 	int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
     98 	    wscale_mod, optcnt, ts0;
     99 	pf_tcpopts_t packed_tcpopts;
    100 	char *class, *version, *subtype, *desc, *tcpopts;
    101 	struct pf_osfp_ioctl fp;
    102 
    103 	pfctl_flush_my_fingerprints(&classes);
    104 
    105 	if ((in = fopen(fp_filename, "r")) == NULL) {
    106 		warn("fopen(%s)", fp_filename);
    107 		return (1);
    108 	}
    109 	class = version = subtype = desc = tcpopts = NULL;
    110 
    111 	if ((opts & PF_OPT_NOACTION) == 0)
    112 		pfctl_clear_fingerprints(dev, opts);
    113 
    114 	while ((line = fgetln(in, &len)) != NULL) {
    115 		lineno++;
    116 		if (class)
    117 			free(class);
    118 		if (version)
    119 			free(version);
    120 		if (subtype)
    121 			free(subtype);
    122 		if (desc)
    123 			free(desc);
    124 		if (tcpopts)
    125 			free(tcpopts);
    126 		class = version = subtype = desc = tcpopts = NULL;
    127 		memset(&fp, 0, sizeof(fp));
    128 
    129 		/* Chop off comment */
    130 		for (i = 0; i < len; i++)
    131 			if (line[i] == '#') {
    132 				len = i;
    133 				break;
    134 			}
    135 		/* Chop off whitespace */
    136 		while (len > 0 && isspace(line[len - 1]))
    137 			len--;
    138 		while (len > 0 && isspace(line[0])) {
    139 			len--;
    140 			line++;
    141 		}
    142 		if (len == 0)
    143 			continue;
    144 
    145 #define T_DC	0x01	/* Allow don't care */
    146 #define T_MSS	0x02	/* Allow MSS multiple */
    147 #define T_MTU	0x04	/* Allow MTU multiple */
    148 #define T_MOD	0x08	/* Allow modulus */
    149 
    150 #define GET_INT(v, mod, n, ty, mx) \
    151 	get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
    152 #define GET_STR(v, n, mn) \
    153 	get_str(&line, &len, &v, n, mn, fp_filename, lineno)
    154 
    155 		if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
    156 		    T_MOD, 0xffff) ||
    157 		    GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
    158 		    GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
    159 		    GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
    160 		    8192) ||
    161 		    GET_STR(tcpopts, "TCP Options", 1) ||
    162 		    GET_STR(class, "OS class", 1) ||
    163 		    GET_STR(version, "OS version", 0) ||
    164 		    GET_STR(subtype, "OS subtype", 0) ||
    165 		    GET_STR(desc, "OS description", 2))
    166 			continue;
    167 		if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
    168 		    &optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
    169 			continue;
    170 		if (len != 0) {
    171 			fprintf(stderr, "%s:%d excess field\n", fp_filename,
    172 			    lineno);
    173 			continue;
    174 		}
    175 
    176 		fp.fp_ttl = ttl;
    177 		if (df)
    178 			fp.fp_flags |= PF_OSFP_DF;
    179 		switch (w_mod) {
    180 		case 0:
    181 			break;
    182 		case T_DC:
    183 			fp.fp_flags |= PF_OSFP_WSIZE_DC;
    184 			break;
    185 		case T_MSS:
    186 			fp.fp_flags |= PF_OSFP_WSIZE_MSS;
    187 			break;
    188 		case T_MTU:
    189 			fp.fp_flags |= PF_OSFP_WSIZE_MTU;
    190 			break;
    191 		case T_MOD:
    192 			fp.fp_flags |= PF_OSFP_WSIZE_MOD;
    193 			break;
    194 		}
    195 		fp.fp_wsize = window;
    196 
    197 		switch (p_mod) {
    198 		case T_DC:
    199 			fp.fp_flags |= PF_OSFP_PSIZE_DC;
    200 			break;
    201 		case T_MOD:
    202 			fp.fp_flags |= PF_OSFP_PSIZE_MOD;
    203 		}
    204 		fp.fp_psize = psize;
    205 
    206 
    207 		switch (wscale_mod) {
    208 		case T_DC:
    209 			fp.fp_flags |= PF_OSFP_WSCALE_DC;
    210 			break;
    211 		case T_MOD:
    212 			fp.fp_flags |= PF_OSFP_WSCALE_MOD;
    213 		}
    214 		fp.fp_wscale = wscale;
    215 
    216 		switch (mss_mod) {
    217 		case T_DC:
    218 			fp.fp_flags |= PF_OSFP_MSS_DC;
    219 			break;
    220 		case T_MOD:
    221 			fp.fp_flags |= PF_OSFP_MSS_MOD;
    222 			break;
    223 		}
    224 		fp.fp_mss = mss;
    225 
    226 		fp.fp_tcpopts = packed_tcpopts;
    227 		fp.fp_optcnt = optcnt;
    228 		if (ts0)
    229 			fp.fp_flags |= PF_OSFP_TS0;
    230 
    231 		if (class[0] == '@')
    232 			fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
    233 		if (class[0] == '*')
    234 			fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
    235 
    236 		if (class[0] == '@' || class[0] == '*')
    237 			strlcpy(fp.fp_os.fp_class_nm, class + 1,
    238 			    sizeof(fp.fp_os.fp_class_nm));
    239 		else
    240 			strlcpy(fp.fp_os.fp_class_nm, class,
    241 			    sizeof(fp.fp_os.fp_class_nm));
    242 		strlcpy(fp.fp_os.fp_version_nm, version,
    243 		    sizeof(fp.fp_os.fp_version_nm));
    244 		strlcpy(fp.fp_os.fp_subtype_nm, subtype,
    245 		    sizeof(fp.fp_os.fp_subtype_nm));
    246 
    247 		add_fingerprint(dev, opts, &fp);
    248 	}
    249 
    250 	if (class)
    251 		free(class);
    252 	if (version)
    253 		free(version);
    254 	if (subtype)
    255 		free(subtype);
    256 	if (desc)
    257 		free(desc);
    258 
    259 	fclose(in);
    260 
    261 	if (opts & PF_OPT_VERBOSE2)
    262 		printf("Loaded %d passive OS fingerprints\n",
    263 		    fingerprint_count);
    264 	return (0);
    265 }
    266 
    267 /* flush the kernel's fingerprints */
    268 void
    269 pfctl_clear_fingerprints(int dev, int opts)
    270 {
    271 	if (ioctl(dev, DIOCOSFPFLUSH))
    272 		err(1, "DIOCOSFPFLUSH");
    273 }
    274 
    275 /* flush pfctl's view of the fingerprints */
    276 void
    277 pfctl_flush_my_fingerprints(struct name_list *list)
    278 {
    279 	struct name_entry *nm;
    280 
    281 	while ((nm = LIST_FIRST(list)) != NULL) {
    282 		LIST_REMOVE(nm, nm_entry);
    283 		pfctl_flush_my_fingerprints(&nm->nm_sublist);
    284 		fingerprint_count--;
    285 		free(nm);
    286 	}
    287 	class_count = 0;
    288 }
    289 
    290 /* Fetch the active fingerprints from the kernel */
    291 int
    292 pfctl_load_fingerprints(int dev, int opts)
    293 {
    294 	struct pf_osfp_ioctl io;
    295 	int i;
    296 
    297 	pfctl_flush_my_fingerprints(&classes);
    298 
    299 	for (i = 0; i >= 0; i++) {
    300 		memset(&io, 0, sizeof(io));
    301 		io.fp_getnum = i;
    302 		if (ioctl(dev, DIOCOSFPGET, &io)) {
    303 			if (errno == EBUSY)
    304 				break;
    305 			warn("DIOCOSFPGET");
    306 			return (1);
    307 		}
    308 		import_fingerprint(&io);
    309 	}
    310 	return (0);
    311 }
    312 
    313 /* List the fingerprints */
    314 void
    315 pfctl_show_fingerprints(int opts)
    316 {
    317 	if (LIST_FIRST(&classes) != NULL) {
    318 		if (opts & PF_OPT_SHOWALL) {
    319 			pfctl_print_title("OS FINGERPRINTS:");
    320 			printf("%u fingerprints loaded\n", fingerprint_count);
    321 		} else {
    322 			printf("Class\tVersion\tSubtype(subversion)\n");
    323 			printf("-----\t-------\t-------------------\n");
    324 			sort_name_list(opts, &classes);
    325 			print_name_list(opts, &classes, "");
    326 		}
    327 	}
    328 }
    329 
    330 /* Lookup a fingerprint */
    331 pf_osfp_t
    332 pfctl_get_fingerprint(const char *name)
    333 {
    334 	struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
    335 	pf_osfp_t ret = PF_OSFP_NOMATCH;
    336 	int class, version, subtype;
    337 	int unp_class, unp_version, unp_subtype;
    338 	int wr_len, version_len, subtype_len;
    339 	char *ptr, *wr_name;
    340 
    341 	if (strcasecmp(name, "unknown") == 0)
    342 		return (PF_OSFP_UNKNOWN);
    343 
    344 	/* Try most likely no version and no subtype */
    345 	if ((nm = lookup_name_list(&classes, name))) {
    346 		class = nm->nm_num;
    347 		version = PF_OSFP_ANY;
    348 		subtype = PF_OSFP_ANY;
    349 		goto found;
    350 	} else {
    351 
    352 		/* Chop it up into class/version/subtype */
    353 
    354 		if ((wr_name = strdup(name)) == NULL)
    355 			err(1, "malloc");
    356 		if ((ptr = index(wr_name, ' ')) == NULL) {
    357 			free(wr_name);
    358 			return (PF_OSFP_NOMATCH);
    359 		}
    360 		*ptr++ = '\0';
    361 
    362 		/* The class is easy to find since it is delimited by a space */
    363 		if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
    364 			free(wr_name);
    365 			return (PF_OSFP_NOMATCH);
    366 		}
    367 		class = class_nm->nm_num;
    368 
    369 		/* Try no subtype */
    370 		if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
    371 		{
    372 			version = version_nm->nm_num;
    373 			subtype = PF_OSFP_ANY;
    374 			free(wr_name);
    375 			goto found;
    376 		}
    377 
    378 
    379 		/*
    380 		 * There must be a version and a subtype.
    381 		 * We'll do some fuzzy matching to pick up things like:
    382 		 *   Linux 2.2.14 (version=2.2 subtype=14)
    383 		 *   FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
    384 		 *   Windows 2000 SP2	(version=2000 subtype=SP2)
    385 		 */
    386 #define CONNECTOR(x)	((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
    387 		wr_len = strlen(ptr);
    388 		LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
    389 			version_len = strlen(version_nm->nm_name);
    390 			if (wr_len < version_len + 2 ||
    391 			    !CONNECTOR(ptr[version_len]))
    392 				continue;
    393 			/* first part of the string must be version */
    394 			if (strncasecmp(ptr, version_nm->nm_name,
    395 			    version_len))
    396 				continue;
    397 
    398 			LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
    399 			    nm_entry) {
    400 				subtype_len = strlen(subtype_nm->nm_name);
    401 				if (wr_len != version_len + subtype_len + 1)
    402 					continue;
    403 
    404 				/* last part of the string must be subtype */
    405 				if (strcasecmp(&ptr[version_len+1],
    406 				    subtype_nm->nm_name) != 0)
    407 					continue;
    408 
    409 				/* Found it!! */
    410 				version = version_nm->nm_num;
    411 				subtype = subtype_nm->nm_num;
    412 				free(wr_name);
    413 				goto found;
    414 			}
    415 		}
    416 
    417 		free(wr_name);
    418 		return (PF_OSFP_NOMATCH);
    419 	}
    420 
    421 found:
    422 	PF_OSFP_PACK(ret, class, version, subtype);
    423 	if (ret != PF_OSFP_NOMATCH) {
    424 		PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
    425 		if (class != unp_class) {
    426 			fprintf(stderr, "warning: fingerprint table overflowed "
    427 			    "classes\n");
    428 			return (PF_OSFP_NOMATCH);
    429 		}
    430 		if (version != unp_version) {
    431 			fprintf(stderr, "warning: fingerprint table overflowed "
    432 			    "versions\n");
    433 			return (PF_OSFP_NOMATCH);
    434 		}
    435 		if (subtype != unp_subtype) {
    436 			fprintf(stderr, "warning: fingerprint table overflowed "
    437 			    "subtypes\n");
    438 			return (PF_OSFP_NOMATCH);
    439 		}
    440 	}
    441 	if (ret == PF_OSFP_ANY) {
    442 		/* should never happen */
    443 		fprintf(stderr, "warning: fingerprint packed to 'any'\n");
    444 		return (PF_OSFP_NOMATCH);
    445 	}
    446 
    447 	return (ret);
    448 }
    449 
    450 /* Lookup a fingerprint name by ID */
    451 char *
    452 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
    453 {
    454 	int class, version, subtype;
    455 	struct name_list *list;
    456 	struct name_entry *nm;
    457 
    458 	char *class_name, *version_name, *subtype_name;
    459 	class_name = version_name = subtype_name = NULL;
    460 
    461 	if (fp == PF_OSFP_UNKNOWN) {
    462 		strlcpy(buf, "unknown", len);
    463 		return (buf);
    464 	}
    465 	if (fp == PF_OSFP_ANY) {
    466 		strlcpy(buf, "any", len);
    467 		return (buf);
    468 	}
    469 
    470 	PF_OSFP_UNPACK(fp, class, version, subtype);
    471 	if (class >= (1 << _FP_CLASS_BITS) ||
    472 	    version >= (1 << _FP_VERSION_BITS) ||
    473 	    subtype >= (1 << _FP_SUBTYPE_BITS)) {
    474 		warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
    475 		strlcpy(buf, "nomatch", len);
    476 		return (buf);
    477 	}
    478 
    479 	LIST_FOREACH(nm, &classes, nm_entry) {
    480 		if (nm->nm_num == class) {
    481 			class_name = nm->nm_name;
    482 			if (version == PF_OSFP_ANY)
    483 				goto found;
    484 			list = &nm->nm_sublist;
    485 			LIST_FOREACH(nm, list, nm_entry) {
    486 				if (nm->nm_num == version) {
    487 					version_name = nm->nm_name;
    488 					if (subtype == PF_OSFP_ANY)
    489 						goto found;
    490 					list = &nm->nm_sublist;
    491 					LIST_FOREACH(nm, list, nm_entry) {
    492 						if (nm->nm_num == subtype) {
    493 							subtype_name =
    494 							    nm->nm_name;
    495 							goto found;
    496 						}
    497 					} /* foreach subtype */
    498 					strlcpy(buf, "nomatch", len);
    499 					return (buf);
    500 				}
    501 			} /* foreach version */
    502 			strlcpy(buf, "nomatch", len);
    503 			return (buf);
    504 		}
    505 	} /* foreach class */
    506 
    507 	strlcpy(buf, "nomatch", len);
    508 	return (buf);
    509 
    510 found:
    511 	snprintf(buf, len, "%s", class_name);
    512 	if (version_name) {
    513 		strlcat(buf, " ", len);
    514 		strlcat(buf, version_name, len);
    515 		if (subtype_name) {
    516 			if (index(version_name, ' '))
    517 				strlcat(buf, " ", len);
    518 			else if (index(version_name, '.') &&
    519 			    isdigit(*subtype_name))
    520 				strlcat(buf, ".", len);
    521 			else
    522 				strlcat(buf, " ", len);
    523 			strlcat(buf, subtype_name, len);
    524 		}
    525 	}
    526 	return (buf);
    527 }
    528 
    529 /* lookup a name in a list */
    530 struct name_entry *
    531 lookup_name_list(struct name_list *list, const char *name)
    532 {
    533 	struct name_entry *nm;
    534 	LIST_FOREACH(nm, list, nm_entry)
    535 		if (strcasecmp(name, nm->nm_name) == 0)
    536 			return (nm);
    537 
    538 	return (NULL);
    539 }
    540 
    541 
    542 void
    543 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
    544 {
    545 	struct pf_osfp_ioctl fptmp;
    546 	struct name_entry *nm_class, *nm_version, *nm_subtype;
    547 	int class, version, subtype;
    548 
    549 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
    550 #define EXPAND(field) do {						\
    551 	int _dot = -1, _start = -1, _end = -1, _i = 0;			\
    552 	/* pick major version out of #.# */				\
    553 	if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') {		\
    554 		_dot = fp->field[_i] - '0';				\
    555 		_i += 2;						\
    556 	}								\
    557 	if (isdigit(fp->field[_i]))					\
    558 		_start = fp->field[_i++] - '0';				\
    559 	else								\
    560 		break;							\
    561 	if (isdigit(fp->field[_i]))					\
    562 		_start = (_start * 10) + fp->field[_i++] - '0';		\
    563 	if (fp->field[_i++] != '-')					\
    564 		break;							\
    565 	if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' &&		\
    566 	    fp->field[_i] - '0' == _dot)				\
    567 		_i += 2;						\
    568 	else if (_dot != -1)						\
    569 		break;							\
    570 	if (isdigit(fp->field[_i]))					\
    571 		_end = fp->field[_i++] - '0';				\
    572 	else								\
    573 		break;							\
    574 	if (isdigit(fp->field[_i]))					\
    575 		_end = (_end * 10) + fp->field[_i++] - '0';		\
    576 	if (isdigit(fp->field[_i]))					\
    577 		_end = (_end * 10) + fp->field[_i++] - '0';		\
    578 	if (fp->field[_i] != '\0')					\
    579 		break;							\
    580 	memcpy(&fptmp, fp, sizeof(fptmp));				\
    581 	for (;_start <= _end; _start++) {				\
    582 		memset(fptmp.field, 0, sizeof(fptmp.field));		\
    583 		fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED;		\
    584 		if (_dot == -1)						\
    585 			snprintf(fptmp.field, sizeof(fptmp.field),	\
    586 			    "%d", _start);				\
    587 		    else						\
    588 			snprintf(fptmp.field, sizeof(fptmp.field),	\
    589 			    "%d.%d", _dot, _start);			\
    590 		add_fingerprint(dev, opts, &fptmp);			\
    591 	}								\
    592 } while(0)
    593 
    594 	/* We allow "#-#" as a version or subtype and we'll expand it */
    595 	EXPAND(fp_os.fp_version_nm);
    596 	EXPAND(fp_os.fp_subtype_nm);
    597 
    598 	if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
    599 		errx(1, "fingerprint class \"nomatch\" is reserved");
    600 
    601 	version = PF_OSFP_ANY;
    602 	subtype = PF_OSFP_ANY;
    603 
    604 	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
    605 	if (nm_class->nm_num == 0)
    606 		nm_class->nm_num = ++class_count;
    607 	class = nm_class->nm_num;
    608 
    609 	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
    610 	    fp->fp_os.fp_version_nm);
    611 	if (nm_version) {
    612 		if (nm_version->nm_num == 0)
    613 			nm_version->nm_num = ++nm_class->nm_sublist_num;
    614 		version = nm_version->nm_num;
    615 		nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
    616 		    fp->fp_os.fp_subtype_nm);
    617 		if (nm_subtype) {
    618 			if (nm_subtype->nm_num == 0)
    619 				nm_subtype->nm_num =
    620 				    ++nm_version->nm_sublist_num;
    621 			subtype = nm_subtype->nm_num;
    622 		}
    623 	}
    624 
    625 
    626 	DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
    627 	    print_ioctl(fp));
    628 
    629 	PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
    630 	fingerprint_count++;
    631 
    632 #ifdef FAKE_PF_KERNEL
    633 	/* Linked to the sys/net/pf_osfp.c.  Call pf_osfp_add() */
    634 	if ((errno = pf_osfp_add(fp)))
    635 #else
    636 	if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
    637 #endif /* FAKE_PF_KERNEL */
    638 	{
    639 		if (errno == EEXIST) {
    640 			warn("Duplicate signature for %s %s %s",
    641 				fp->fp_os.fp_class_nm,
    642 				fp->fp_os.fp_version_nm,
    643 				fp->fp_os.fp_subtype_nm);
    644 
    645 		} else {
    646 			err(1, "DIOCOSFPADD");
    647 		}
    648 	}
    649 }
    650 
    651 /* import a fingerprint from the kernel */
    652 void
    653 import_fingerprint(struct pf_osfp_ioctl *fp)
    654 {
    655 	struct name_entry *nm_class, *nm_version, *nm_subtype;
    656 	int class, version, subtype;
    657 
    658 	PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
    659 
    660 	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
    661 	if (nm_class->nm_num == 0) {
    662 		nm_class->nm_num = class;
    663 		class_count = MAX(class_count, class);
    664 	}
    665 
    666 	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
    667 	    fp->fp_os.fp_version_nm);
    668 	if (nm_version) {
    669 		if (nm_version->nm_num == 0) {
    670 			nm_version->nm_num = version;
    671 			nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
    672 			    version);
    673 		}
    674 		nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
    675 		    fp->fp_os.fp_subtype_nm);
    676 		if (nm_subtype) {
    677 			if (nm_subtype->nm_num == 0) {
    678 				nm_subtype->nm_num = subtype;
    679 				nm_version->nm_sublist_num =
    680 				    MAX(nm_version->nm_sublist_num, subtype);
    681 			}
    682 		}
    683 	}
    684 
    685 
    686 	fingerprint_count++;
    687 	DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
    688 }
    689 
    690 /* Find an entry for a fingerprints class/version/subtype */
    691 struct name_entry *
    692 fingerprint_name_entry(struct name_list *list, char *name)
    693 {
    694 	struct name_entry *nm_entry;
    695 
    696 	if (name == NULL || strlen(name) == 0)
    697 		return (NULL);
    698 
    699 	LIST_FOREACH(nm_entry, list, nm_entry) {
    700 		if (strcasecmp(nm_entry->nm_name, name) == 0) {
    701 			/* We'll move this to the front of the list later */
    702 			LIST_REMOVE(nm_entry, nm_entry);
    703 			break;
    704 		}
    705 	}
    706 	if (nm_entry == NULL) {
    707 		nm_entry = calloc(1, sizeof(*nm_entry));
    708 		if (nm_entry == NULL)
    709 			err(1, "calloc");
    710 			LIST_INIT(&nm_entry->nm_sublist);
    711 			strlcpy(nm_entry->nm_name, name,
    712 			    sizeof(nm_entry->nm_name));
    713 	}
    714 	LIST_INSERT_HEAD(list, nm_entry, nm_entry);
    715 	return (nm_entry);
    716 }
    717 
    718 
    719 void
    720 print_name_list(int opts, struct name_list *nml, const char *prefix)
    721 {
    722 	char newprefix[32];
    723 	struct name_entry *nm;
    724 
    725 	LIST_FOREACH(nm, nml, nm_entry) {
    726 		snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
    727 		    nm->nm_name);
    728 		printf("%s\n", newprefix);
    729 		print_name_list(opts, &nm->nm_sublist, newprefix);
    730 	}
    731 }
    732 
    733 void
    734 sort_name_list(int opts, struct name_list *nml)
    735 {
    736 	struct name_list new;
    737 	struct name_entry *nm, *nmsearch, *nmlast;
    738 
    739 	/* yes yes, it's a very slow sort.  so sue me */
    740 
    741 	LIST_INIT(&new);
    742 
    743 	while ((nm = LIST_FIRST(nml)) != NULL) {
    744 		LIST_REMOVE(nm, nm_entry);
    745 		nmlast = NULL;
    746 		LIST_FOREACH(nmsearch, &new, nm_entry) {
    747 			if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
    748 				LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
    749 				break;
    750 			}
    751 			nmlast = nmsearch;
    752 		}
    753 		if (nmsearch == NULL) {
    754 			if (nmlast)
    755 				LIST_INSERT_AFTER(nmlast, nm, nm_entry);
    756 			else
    757 				LIST_INSERT_HEAD(&new, nm, nm_entry);
    758 		}
    759 
    760 		sort_name_list(opts, &nm->nm_sublist);
    761 	}
    762 	nmlast = NULL;
    763 	while ((nm = LIST_FIRST(&new)) != NULL) {
    764 		LIST_REMOVE(nm, nm_entry);
    765 		if (nmlast == NULL)
    766 			LIST_INSERT_HEAD(nml, nm, nm_entry);
    767 		else
    768 			LIST_INSERT_AFTER(nmlast, nm, nm_entry);
    769 		nmlast = nm;
    770 	}
    771 	return;
    772 }
    773 
    774 /* parse the next integer in a formatted config file line */
    775 int
    776 get_int(char **line, size_t *len, int *var, int *mod,
    777     const char *name, int flags, int max, const char *filename, int lineno)
    778 {
    779 	int fieldlen, i;
    780 	char *field;
    781 	long val = 0;
    782 
    783 	if (mod)
    784 		*mod = 0;
    785 	*var = 0;
    786 
    787 	field = get_field(line, len, &fieldlen);
    788 	if (field == NULL)
    789 		return (1);
    790 	if (fieldlen == 0) {
    791 		fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
    792 		return (1);
    793 	}
    794 
    795 	i = 0;
    796 	if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
    797 	    && fieldlen >= 1) {
    798 		switch (*field) {
    799 		case 'S':
    800 			if (mod && (flags & T_MSS))
    801 				*mod = T_MSS;
    802 			if (fieldlen == 1)
    803 				return (0);
    804 			break;
    805 		case 'T':
    806 			if (mod && (flags & T_MTU))
    807 				*mod = T_MTU;
    808 			if (fieldlen == 1)
    809 				return (0);
    810 			break;
    811 		case '*':
    812 			if (fieldlen != 1) {
    813 				fprintf(stderr, "%s:%d long '%c' %s\n",
    814 				    filename, lineno, *field, name);
    815 				return (1);
    816 			}
    817 			if (mod && (flags & T_DC)) {
    818 				*mod = T_DC;
    819 				return (0);
    820 			}
    821 		case '%':
    822 			if (mod && (flags & T_MOD))
    823 				*mod = T_MOD;
    824 			if (fieldlen == 1) {
    825 				fprintf(stderr, "%s:%d modulus %s must have a "
    826 				    "value\n", filename, lineno, name);
    827 				return (1);
    828 			}
    829 			break;
    830 		}
    831 		if (mod == NULL || *mod == 0) {
    832 			fprintf(stderr, "%s:%d does not allow %c' %s\n",
    833 			    filename, lineno, *field, name);
    834 			return (1);
    835 		}
    836 		i++;
    837 	}
    838 
    839 	for (; i < fieldlen; i++) {
    840 		if (field[i] < '0' || field[i] > '9') {
    841 			fprintf(stderr, "%s:%d non-digit character in %s\n",
    842 			    filename, lineno, name);
    843 			return (1);
    844 		}
    845 		val = val * 10 + field[i] - '0';
    846 		if (val < 0) {
    847 			fprintf(stderr, "%s:%d %s overflowed\n", filename,
    848 			    lineno, name);
    849 			return (1);
    850 		}
    851 	}
    852 
    853 	if (val > max) {
    854 		fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
    855 		    name, val, max);
    856 		return (1);
    857 	}
    858 	*var = (int)val;
    859 
    860 	return (0);
    861 }
    862 
    863 /* parse the next string in a formatted config file line */
    864 int
    865 get_str(char **line, size_t *len, char **v, const char *name, int minlen,
    866     const char *filename, int lineno)
    867 {
    868 	int fieldlen;
    869 	char *ptr;
    870 
    871 	ptr = get_field(line, len, &fieldlen);
    872 	if (ptr == NULL)
    873 		return (1);
    874 	if (fieldlen < minlen) {
    875 		fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
    876 		return (1);
    877 	}
    878 	if ((*v = malloc(fieldlen + 1)) == NULL) {
    879 		perror("malloc()");
    880 		return (1);
    881 	}
    882 	memcpy(*v, ptr, fieldlen);
    883 	(*v)[fieldlen] = '\0';
    884 
    885 	return (0);
    886 }
    887 
    888 /* Parse out the TCP opts */
    889 int
    890 get_tcpopts(const char *filename, int lineno, const char *tcpopts,
    891     pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
    892     int *wscale_mod, int *ts0)
    893 {
    894 	int i, opt;
    895 
    896 	*packed = 0;
    897 	*optcnt = 0;
    898 	*wscale = 0;
    899 	*wscale_mod = T_DC;
    900 	*mss = 0;
    901 	*mss_mod = T_DC;
    902 	*ts0 = 0;
    903 	if (strcmp(tcpopts, ".") == 0)
    904 		return (0);
    905 
    906 	for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
    907 		switch ((opt = toupper(tcpopts[i++]))) {
    908 		case 'N':	/* FALLTHROUGH */
    909 		case 'S':
    910 			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
    911 			    (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
    912 			    PF_OSFP_TCPOPT_SACK);
    913 			break;
    914 		case 'W':	/* FALLTHROUGH */
    915 		case 'M': {
    916 			int *this_mod, *this;
    917 
    918 			if (opt == 'W') {
    919 				this = wscale;
    920 				this_mod = wscale_mod;
    921 			} else {
    922 				this = mss;
    923 				this_mod = mss_mod;
    924 			}
    925 			*this = 0;
    926 			*this_mod = 0;
    927 
    928 			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
    929 			    (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
    930 			    PF_OSFP_TCPOPT_MSS);
    931 			if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
    932 			    tcpopts[i + 1] == ',')) {
    933 				*this_mod = T_DC;
    934 				i++;
    935 				break;
    936 			}
    937 
    938 			if (tcpopts[i] == '%') {
    939 				*this_mod = T_MOD;
    940 				i++;
    941 			}
    942 			do {
    943 				if (!isdigit(tcpopts[i])) {
    944 					fprintf(stderr, "%s:%d unknown "
    945 					    "character '%c' in %c TCP opt\n",
    946 					    filename, lineno, tcpopts[i], opt);
    947 					return (1);
    948 				}
    949 				*this = (*this * 10) + tcpopts[i++] - '0';
    950 			} while(tcpopts[i] != ',' && tcpopts[i] != '\0');
    951 			break;
    952 		}
    953 		case 'T':
    954 			if (tcpopts[i] == '0') {
    955 				*ts0 = 1;
    956 				i++;
    957 			}
    958 			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
    959 			    PF_OSFP_TCPOPT_TS;
    960 			break;
    961 		}
    962 		(*optcnt) ++;
    963 		if (tcpopts[i] == '\0')
    964 			break;
    965 		if (tcpopts[i] != ',') {
    966 			fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
    967 			    filename, lineno, opt);
    968 			return (1);
    969 		}
    970 		i++;
    971 	}
    972 
    973 	return (0);
    974 }
    975 
    976 /* rip the next field ouf of a formatted config file line */
    977 char *
    978 get_field(char **line, size_t *len, int *fieldlen)
    979 {
    980 	char *ret, *ptr = *line;
    981 	size_t plen = *len;
    982 
    983 
    984 	while (plen && isspace(*ptr)) {
    985 		plen--;
    986 		ptr++;
    987 	}
    988 	ret = ptr;
    989 	*fieldlen = 0;
    990 
    991 	for (; plen > 0 && *ptr != ':'; plen--, ptr++)
    992 		(*fieldlen)++;
    993 	if (plen) {
    994 		*line = ptr + 1;
    995 		*len = plen - 1;
    996 	} else {
    997 		*len = 0;
    998 	}
    999 	while (*fieldlen && isspace(ret[*fieldlen - 1]))
   1000 		(*fieldlen)--;
   1001 	return (ret);
   1002 }
   1003 
   1004 
   1005 const char *
   1006 print_ioctl(struct pf_osfp_ioctl *fp)
   1007 {
   1008 	static char buf[1024];
   1009 	char tmp[32];
   1010 	int i, opt;
   1011 
   1012 	*buf = '\0';
   1013 	if (fp->fp_flags & PF_OSFP_WSIZE_DC)
   1014 		strlcat(buf, "*", sizeof(buf));
   1015 	else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
   1016 		strlcat(buf, "S", sizeof(buf));
   1017 	else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
   1018 		strlcat(buf, "T", sizeof(buf));
   1019 	else {
   1020 		if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
   1021 			strlcat(buf, "%", sizeof(buf));
   1022 		snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
   1023 		strlcat(buf, tmp, sizeof(buf));
   1024 	}
   1025 	strlcat(buf, ":", sizeof(buf));
   1026 
   1027 	snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
   1028 	strlcat(buf, tmp, sizeof(buf));
   1029 	strlcat(buf, ":", sizeof(buf));
   1030 
   1031 	if (fp->fp_flags & PF_OSFP_DF)
   1032 		strlcat(buf, "1", sizeof(buf));
   1033 	else
   1034 		strlcat(buf, "0", sizeof(buf));
   1035 	strlcat(buf, ":", sizeof(buf));
   1036 
   1037 	if (fp->fp_flags & PF_OSFP_PSIZE_DC)
   1038 		strlcat(buf, "*", sizeof(buf));
   1039 	else {
   1040 		if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
   1041 			strlcat(buf, "%", sizeof(buf));
   1042 		snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
   1043 		strlcat(buf, tmp, sizeof(buf));
   1044 	}
   1045 	strlcat(buf, ":", sizeof(buf));
   1046 
   1047 	if (fp->fp_optcnt == 0)
   1048 		strlcat(buf, ".", sizeof(buf));
   1049 	for (i = fp->fp_optcnt - 1; i >= 0; i--) {
   1050 		opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
   1051 		opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
   1052 		switch (opt) {
   1053 		case PF_OSFP_TCPOPT_NOP:
   1054 			strlcat(buf, "N", sizeof(buf));
   1055 			break;
   1056 		case PF_OSFP_TCPOPT_SACK:
   1057 			strlcat(buf, "S", sizeof(buf));
   1058 			break;
   1059 		case PF_OSFP_TCPOPT_TS:
   1060 			strlcat(buf, "T", sizeof(buf));
   1061 			if (fp->fp_flags & PF_OSFP_TS0)
   1062 				strlcat(buf, "0", sizeof(buf));
   1063 			break;
   1064 		case PF_OSFP_TCPOPT_MSS:
   1065 			strlcat(buf, "M", sizeof(buf));
   1066 			if (fp->fp_flags & PF_OSFP_MSS_DC)
   1067 				strlcat(buf, "*", sizeof(buf));
   1068 			else {
   1069 				if (fp->fp_flags & PF_OSFP_MSS_MOD)
   1070 					strlcat(buf, "%", sizeof(buf));
   1071 				snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
   1072 				strlcat(buf, tmp, sizeof(buf));
   1073 			}
   1074 			break;
   1075 		case PF_OSFP_TCPOPT_WSCALE:
   1076 			strlcat(buf, "W", sizeof(buf));
   1077 			if (fp->fp_flags & PF_OSFP_WSCALE_DC)
   1078 				strlcat(buf, "*", sizeof(buf));
   1079 			else {
   1080 				if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
   1081 					strlcat(buf, "%", sizeof(buf));
   1082 				snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
   1083 				strlcat(buf, tmp, sizeof(buf));
   1084 			}
   1085 			break;
   1086 		}
   1087 
   1088 		if (i != 0)
   1089 			strlcat(buf, ",", sizeof(buf));
   1090 	}
   1091 	strlcat(buf, ":", sizeof(buf));
   1092 
   1093 	strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
   1094 	strlcat(buf, ":", sizeof(buf));
   1095 	strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
   1096 	strlcat(buf, ":", sizeof(buf));
   1097 	strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
   1098 	strlcat(buf, ":", sizeof(buf));
   1099 
   1100 	snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
   1101 	    (long long int)fp->fp_tcpopts);
   1102 	strlcat(buf, tmp, sizeof(buf));
   1103 
   1104 	return (buf);
   1105 }
   1106