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pfctl_osfp.c revision 1.6 
      1 /*	$NetBSD: pfctl_osfp.c,v 1.6 2006/03/21 20:31:56 christos Exp $	*/
      2 /*	$OpenBSD: pfctl_osfp.c,v 1.12 2005/02/17 13:18:00 aaron 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 = pfctl_fopen(fp_filename, "r")) == NULL) {
    106 		warn("%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((unsigned char)line[len - 1]))
    137 			len--;
    138 		while (len > 0 && isspace((unsigned char)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 	if (tcpopts)
    259 		free(tcpopts);
    260 
    261 	fclose(in);
    262 
    263 	if (opts & PF_OPT_VERBOSE2)
    264 		printf("Loaded %d passive OS fingerprints\n",
    265 		    fingerprint_count);
    266 	return (0);
    267 }
    268 
    269 /* flush the kernel's fingerprints */
    270 void
    271 pfctl_clear_fingerprints(int dev, int opts)
    272 {
    273 	if (ioctl(dev, DIOCOSFPFLUSH))
    274 		err(1, "DIOCOSFPFLUSH");
    275 }
    276 
    277 /* flush pfctl's view of the fingerprints */
    278 void
    279 pfctl_flush_my_fingerprints(struct name_list *list)
    280 {
    281 	struct name_entry *nm;
    282 
    283 	while ((nm = LIST_FIRST(list)) != NULL) {
    284 		LIST_REMOVE(nm, nm_entry);
    285 		pfctl_flush_my_fingerprints(&nm->nm_sublist);
    286 		free(nm);
    287 	}
    288 	fingerprint_count = 0;
    289 	class_count = 0;
    290 }
    291 
    292 /* Fetch the active fingerprints from the kernel */
    293 int
    294 pfctl_load_fingerprints(int dev, int opts)
    295 {
    296 	struct pf_osfp_ioctl io;
    297 	int i;
    298 
    299 	pfctl_flush_my_fingerprints(&classes);
    300 
    301 	for (i = 0; i >= 0; i++) {
    302 		memset(&io, 0, sizeof(io));
    303 		io.fp_getnum = i;
    304 		if (ioctl(dev, DIOCOSFPGET, &io)) {
    305 			if (errno == EBUSY)
    306 				break;
    307 			warn("DIOCOSFPGET");
    308 			return (1);
    309 		}
    310 		import_fingerprint(&io);
    311 	}
    312 	return (0);
    313 }
    314 
    315 /* List the fingerprints */
    316 void
    317 pfctl_show_fingerprints(int opts)
    318 {
    319 	if (LIST_FIRST(&classes) != NULL) {
    320 		if (opts & PF_OPT_SHOWALL) {
    321 			pfctl_print_title("OS FINGERPRINTS:");
    322 			printf("%u fingerprints loaded\n", fingerprint_count);
    323 		} else {
    324 			printf("Class\tVersion\tSubtype(subversion)\n");
    325 			printf("-----\t-------\t-------------------\n");
    326 			sort_name_list(opts, &classes);
    327 			print_name_list(opts, &classes, "");
    328 		}
    329 	}
    330 }
    331 
    332 /* Lookup a fingerprint */
    333 pf_osfp_t
    334 pfctl_get_fingerprint(const char *name)
    335 {
    336 	struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
    337 	pf_osfp_t ret = PF_OSFP_NOMATCH;
    338 	int class, version, subtype;
    339 	int unp_class, unp_version, unp_subtype;
    340 	int wr_len, version_len, subtype_len;
    341 	char *ptr, *wr_name;
    342 
    343 	if (strcasecmp(name, "unknown") == 0)
    344 		return (PF_OSFP_UNKNOWN);
    345 
    346 	/* Try most likely no version and no subtype */
    347 	if ((nm = lookup_name_list(&classes, name))) {
    348 		class = nm->nm_num;
    349 		version = PF_OSFP_ANY;
    350 		subtype = PF_OSFP_ANY;
    351 		goto found;
    352 	} else {
    353 
    354 		/* Chop it up into class/version/subtype */
    355 
    356 		if ((wr_name = strdup(name)) == NULL)
    357 			err(1, "malloc");
    358 		if ((ptr = strchr(wr_name, ' ')) == NULL) {
    359 			free(wr_name);
    360 			return (PF_OSFP_NOMATCH);
    361 		}
    362 		*ptr++ = '\0';
    363 
    364 		/* The class is easy to find since it is delimited by a space */
    365 		if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
    366 			free(wr_name);
    367 			return (PF_OSFP_NOMATCH);
    368 		}
    369 		class = class_nm->nm_num;
    370 
    371 		/* Try no subtype */
    372 		if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
    373 		{
    374 			version = version_nm->nm_num;
    375 			subtype = PF_OSFP_ANY;
    376 			free(wr_name);
    377 			goto found;
    378 		}
    379 
    380 
    381 		/*
    382 		 * There must be a version and a subtype.
    383 		 * We'll do some fuzzy matching to pick up things like:
    384 		 *   Linux 2.2.14 (version=2.2 subtype=14)
    385 		 *   FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
    386 		 *   Windows 2000 SP2	(version=2000 subtype=SP2)
    387 		 */
    388 #define CONNECTOR(x)	((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
    389 		wr_len = strlen(ptr);
    390 		LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
    391 			version_len = strlen(version_nm->nm_name);
    392 			if (wr_len < version_len + 2 ||
    393 			    !CONNECTOR(ptr[version_len]))
    394 				continue;
    395 			/* first part of the string must be version */
    396 			if (strncasecmp(ptr, version_nm->nm_name,
    397 			    version_len))
    398 				continue;
    399 
    400 			LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
    401 			    nm_entry) {
    402 				subtype_len = strlen(subtype_nm->nm_name);
    403 				if (wr_len != version_len + subtype_len + 1)
    404 					continue;
    405 
    406 				/* last part of the string must be subtype */
    407 				if (strcasecmp(&ptr[version_len+1],
    408 				    subtype_nm->nm_name) != 0)
    409 					continue;
    410 
    411 				/* Found it!! */
    412 				version = version_nm->nm_num;
    413 				subtype = subtype_nm->nm_num;
    414 				free(wr_name);
    415 				goto found;
    416 			}
    417 		}
    418 
    419 		free(wr_name);
    420 		return (PF_OSFP_NOMATCH);
    421 	}
    422 
    423 found:
    424 	PF_OSFP_PACK(ret, class, version, subtype);
    425 	if (ret != PF_OSFP_NOMATCH) {
    426 		PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
    427 		if (class != unp_class) {
    428 			fprintf(stderr, "warning: fingerprint table overflowed "
    429 			    "classes\n");
    430 			return (PF_OSFP_NOMATCH);
    431 		}
    432 		if (version != unp_version) {
    433 			fprintf(stderr, "warning: fingerprint table overflowed "
    434 			    "versions\n");
    435 			return (PF_OSFP_NOMATCH);
    436 		}
    437 		if (subtype != unp_subtype) {
    438 			fprintf(stderr, "warning: fingerprint table overflowed "
    439 			    "subtypes\n");
    440 			return (PF_OSFP_NOMATCH);
    441 		}
    442 	}
    443 	if (ret == PF_OSFP_ANY) {
    444 		/* should never happen */
    445 		fprintf(stderr, "warning: fingerprint packed to 'any'\n");
    446 		return (PF_OSFP_NOMATCH);
    447 	}
    448 
    449 	return (ret);
    450 }
    451 
    452 /* Lookup a fingerprint name by ID */
    453 char *
    454 pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
    455 {
    456 	int class, version, subtype;
    457 	struct name_list *list;
    458 	struct name_entry *nm;
    459 
    460 	char *class_name, *version_name, *subtype_name;
    461 	class_name = version_name = subtype_name = NULL;
    462 
    463 	if (fp == PF_OSFP_UNKNOWN) {
    464 		strlcpy(buf, "unknown", len);
    465 		return (buf);
    466 	}
    467 	if (fp == PF_OSFP_ANY) {
    468 		strlcpy(buf, "any", len);
    469 		return (buf);
    470 	}
    471 
    472 	PF_OSFP_UNPACK(fp, class, version, subtype);
    473 	if (class >= (1 << _FP_CLASS_BITS) ||
    474 	    version >= (1 << _FP_VERSION_BITS) ||
    475 	    subtype >= (1 << _FP_SUBTYPE_BITS)) {
    476 		warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
    477 		strlcpy(buf, "nomatch", len);
    478 		return (buf);
    479 	}
    480 
    481 	LIST_FOREACH(nm, &classes, nm_entry) {
    482 		if (nm->nm_num == class) {
    483 			class_name = nm->nm_name;
    484 			if (version == PF_OSFP_ANY)
    485 				goto found;
    486 			list = &nm->nm_sublist;
    487 			LIST_FOREACH(nm, list, nm_entry) {
    488 				if (nm->nm_num == version) {
    489 					version_name = nm->nm_name;
    490 					if (subtype == PF_OSFP_ANY)
    491 						goto found;
    492 					list = &nm->nm_sublist;
    493 					LIST_FOREACH(nm, list, nm_entry) {
    494 						if (nm->nm_num == subtype) {
    495 							subtype_name =
    496 							    nm->nm_name;
    497 							goto found;
    498 						}
    499 					} /* foreach subtype */
    500 					strlcpy(buf, "nomatch", len);
    501 					return (buf);
    502 				}
    503 			} /* foreach version */
    504 			strlcpy(buf, "nomatch", len);
    505 			return (buf);
    506 		}
    507 	} /* foreach class */
    508 
    509 	strlcpy(buf, "nomatch", len);
    510 	return (buf);
    511 
    512 found:
    513 	snprintf(buf, len, "%s", class_name);
    514 	if (version_name) {
    515 		strlcat(buf, " ", len);
    516 		strlcat(buf, version_name, len);
    517 		if (subtype_name) {
    518 			if (strchr(version_name, ' '))
    519 				strlcat(buf, " ", len);
    520 			else if (strchr(version_name, '.') &&
    521 			    isdigit((unsigned char)*subtype_name))
    522 				strlcat(buf, ".", len);
    523 			else
    524 				strlcat(buf, " ", len);
    525 			strlcat(buf, subtype_name, len);
    526 		}
    527 	}
    528 	return (buf);
    529 }
    530 
    531 /* lookup a name in a list */
    532 struct name_entry *
    533 lookup_name_list(struct name_list *list, const char *name)
    534 {
    535 	struct name_entry *nm;
    536 	LIST_FOREACH(nm, list, nm_entry)
    537 		if (strcasecmp(name, nm->nm_name) == 0)
    538 			return (nm);
    539 
    540 	return (NULL);
    541 }
    542 
    543 
    544 void
    545 add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
    546 {
    547 	struct pf_osfp_ioctl fptmp;
    548 	struct name_entry *nm_class, *nm_version, *nm_subtype;
    549 	int class, version, subtype;
    550 
    551 /* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
    552 #define EXPAND(field) do {						\
    553 	int _dot = -1, _start = -1, _end = -1, _i = 0;			\
    554 	/* pick major version out of #.# */				\
    555 	if (isdigit((unsigned char)fp->field[_i]) && fp->field[_i+1] == '.') { \
    556 		_dot = fp->field[_i] - '0';				\
    557 		_i += 2;						\
    558 	}								\
    559 	if (isdigit((unsigned char)fp->field[_i]))			\
    560 		_start = fp->field[_i++] - '0';				\
    561 	else								\
    562 		break;							\
    563 	if (isdigit((unsigned char)fp->field[_i]))			\
    564 		_start = (_start * 10) + fp->field[_i++] - '0';		\
    565 	if (fp->field[_i++] != '-')					\
    566 		break;							\
    567 	if (isdigit((unsigned char)fp->field[_i]) && fp->field[_i+1] == '.' && \
    568 	    fp->field[_i] - '0' == _dot)				\
    569 		_i += 2;						\
    570 	else if (_dot != -1)						\
    571 		break;							\
    572 	if (isdigit((unsigned char)fp->field[_i]))			\
    573 		_end = fp->field[_i++] - '0';				\
    574 	else								\
    575 		break;							\
    576 	if (isdigit((unsigned char)fp->field[_i]))			\
    577 		_end = (_end * 10) + fp->field[_i++] - '0';		\
    578 	if (isdigit((unsigned char)fp->field[_i]))			\
    579 		_end = (_end * 10) + fp->field[_i++] - '0';		\
    580 	if (fp->field[_i] != '\0')					\
    581 		break;							\
    582 	memcpy(&fptmp, fp, sizeof(fptmp));				\
    583 	for (;_start <= _end; _start++) {				\
    584 		memset(fptmp.field, 0, sizeof(fptmp.field));		\
    585 		fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED;		\
    586 		if (_dot == -1)						\
    587 			snprintf(fptmp.field, sizeof(fptmp.field),	\
    588 			    "%d", _start);				\
    589 		    else						\
    590 			snprintf(fptmp.field, sizeof(fptmp.field),	\
    591 			    "%d.%d", _dot, _start);			\
    592 		add_fingerprint(dev, opts, &fptmp);			\
    593 	}								\
    594 } while(0)
    595 
    596 	/* We allow "#-#" as a version or subtype and we'll expand it */
    597 	EXPAND(fp_os.fp_version_nm);
    598 	EXPAND(fp_os.fp_subtype_nm);
    599 
    600 	if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
    601 		errx(1, "fingerprint class \"nomatch\" is reserved");
    602 
    603 	version = PF_OSFP_ANY;
    604 	subtype = PF_OSFP_ANY;
    605 
    606 	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
    607 	if (nm_class->nm_num == 0)
    608 		nm_class->nm_num = ++class_count;
    609 	class = nm_class->nm_num;
    610 
    611 	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
    612 	    fp->fp_os.fp_version_nm);
    613 	if (nm_version) {
    614 		if (nm_version->nm_num == 0)
    615 			nm_version->nm_num = ++nm_class->nm_sublist_num;
    616 		version = nm_version->nm_num;
    617 		nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
    618 		    fp->fp_os.fp_subtype_nm);
    619 		if (nm_subtype) {
    620 			if (nm_subtype->nm_num == 0)
    621 				nm_subtype->nm_num =
    622 				    ++nm_version->nm_sublist_num;
    623 			subtype = nm_subtype->nm_num;
    624 		}
    625 	}
    626 
    627 
    628 	DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
    629 	    print_ioctl(fp));
    630 
    631 	PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
    632 	fingerprint_count++;
    633 
    634 #ifdef FAKE_PF_KERNEL
    635 	/* Linked to the sys/net/pf_osfp.c.  Call pf_osfp_add() */
    636 	if ((errno = pf_osfp_add(fp)))
    637 #else
    638 	if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
    639 #endif /* FAKE_PF_KERNEL */
    640 	{
    641 		if (errno == EEXIST) {
    642 			warn("Duplicate signature for %s %s %s",
    643 				fp->fp_os.fp_class_nm,
    644 				fp->fp_os.fp_version_nm,
    645 				fp->fp_os.fp_subtype_nm);
    646 
    647 		} else {
    648 			err(1, "DIOCOSFPADD");
    649 		}
    650 	}
    651 }
    652 
    653 /* import a fingerprint from the kernel */
    654 void
    655 import_fingerprint(struct pf_osfp_ioctl *fp)
    656 {
    657 	struct name_entry *nm_class, *nm_version, *nm_subtype;
    658 	int class, version, subtype;
    659 
    660 	PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
    661 
    662 	nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
    663 	if (nm_class->nm_num == 0) {
    664 		nm_class->nm_num = class;
    665 		class_count = MAX(class_count, class);
    666 	}
    667 
    668 	nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
    669 	    fp->fp_os.fp_version_nm);
    670 	if (nm_version) {
    671 		if (nm_version->nm_num == 0) {
    672 			nm_version->nm_num = version;
    673 			nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
    674 			    version);
    675 		}
    676 		nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
    677 		    fp->fp_os.fp_subtype_nm);
    678 		if (nm_subtype) {
    679 			if (nm_subtype->nm_num == 0) {
    680 				nm_subtype->nm_num = subtype;
    681 				nm_version->nm_sublist_num =
    682 				    MAX(nm_version->nm_sublist_num, subtype);
    683 			}
    684 		}
    685 	}
    686 
    687 
    688 	fingerprint_count++;
    689 	DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
    690 }
    691 
    692 /* Find an entry for a fingerprints class/version/subtype */
    693 struct name_entry *
    694 fingerprint_name_entry(struct name_list *list, char *name)
    695 {
    696 	struct name_entry *nm_entry;
    697 
    698 	if (name == NULL || strlen(name) == 0)
    699 		return (NULL);
    700 
    701 	LIST_FOREACH(nm_entry, list, nm_entry) {
    702 		if (strcasecmp(nm_entry->nm_name, name) == 0) {
    703 			/* We'll move this to the front of the list later */
    704 			LIST_REMOVE(nm_entry, nm_entry);
    705 			break;
    706 		}
    707 	}
    708 	if (nm_entry == NULL) {
    709 		nm_entry = calloc(1, sizeof(*nm_entry));
    710 		if (nm_entry == NULL)
    711 			err(1, "calloc");
    712 		LIST_INIT(&nm_entry->nm_sublist);
    713 		strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
    714 	}
    715 	LIST_INSERT_HEAD(list, nm_entry, nm_entry);
    716 	return (nm_entry);
    717 }
    718 
    719 
    720 void
    721 print_name_list(int opts, struct name_list *nml, const char *prefix)
    722 {
    723 	char newprefix[32];
    724 	struct name_entry *nm;
    725 
    726 	LIST_FOREACH(nm, nml, nm_entry) {
    727 		snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
    728 		    nm->nm_name);
    729 		printf("%s\n", newprefix);
    730 		print_name_list(opts, &nm->nm_sublist, newprefix);
    731 	}
    732 }
    733 
    734 void
    735 sort_name_list(int opts, struct name_list *nml)
    736 {
    737 	struct name_list new;
    738 	struct name_entry *nm, *nmsearch, *nmlast;
    739 
    740 	/* yes yes, it's a very slow sort.  so sue me */
    741 
    742 	LIST_INIT(&new);
    743 
    744 	while ((nm = LIST_FIRST(nml)) != NULL) {
    745 		LIST_REMOVE(nm, nm_entry);
    746 		nmlast = NULL;
    747 		LIST_FOREACH(nmsearch, &new, nm_entry) {
    748 			if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
    749 				LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
    750 				break;
    751 			}
    752 			nmlast = nmsearch;
    753 		}
    754 		if (nmsearch == NULL) {
    755 			if (nmlast)
    756 				LIST_INSERT_AFTER(nmlast, nm, nm_entry);
    757 			else
    758 				LIST_INSERT_HEAD(&new, nm, nm_entry);
    759 		}
    760 
    761 		sort_name_list(opts, &nm->nm_sublist);
    762 	}
    763 	nmlast = NULL;
    764 	while ((nm = LIST_FIRST(&new)) != NULL) {
    765 		LIST_REMOVE(nm, nm_entry);
    766 		if (nmlast == NULL)
    767 			LIST_INSERT_HEAD(nml, nm, nm_entry);
    768 		else
    769 			LIST_INSERT_AFTER(nmlast, nm, nm_entry);
    770 		nmlast = nm;
    771 	}
    772 	return;
    773 }
    774 
    775 /* parse the next integer in a formatted config file line */
    776 int
    777 get_int(char **line, size_t *len, int *var, int *mod,
    778     const char *name, int flags, int max, const char *filename, int lineno)
    779 {
    780 	int fieldlen, i;
    781 	char *field;
    782 	long val = 0;
    783 
    784 	if (mod)
    785 		*mod = 0;
    786 	*var = 0;
    787 
    788 	field = get_field(line, len, &fieldlen);
    789 	if (field == NULL)
    790 		return (1);
    791 	if (fieldlen == 0) {
    792 		fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
    793 		return (1);
    794 	}
    795 
    796 	i = 0;
    797 	if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
    798 	    && fieldlen >= 1) {
    799 		switch (*field) {
    800 		case 'S':
    801 			if (mod && (flags & T_MSS))
    802 				*mod = T_MSS;
    803 			if (fieldlen == 1)
    804 				return (0);
    805 			break;
    806 		case 'T':
    807 			if (mod && (flags & T_MTU))
    808 				*mod = T_MTU;
    809 			if (fieldlen == 1)
    810 				return (0);
    811 			break;
    812 		case '*':
    813 			if (fieldlen != 1) {
    814 				fprintf(stderr, "%s:%d long '%c' %s\n",
    815 				    filename, lineno, *field, name);
    816 				return (1);
    817 			}
    818 			if (mod && (flags & T_DC)) {
    819 				*mod = T_DC;
    820 				return (0);
    821 			}
    822 		case '%':
    823 			if (mod && (flags & T_MOD))
    824 				*mod = T_MOD;
    825 			if (fieldlen == 1) {
    826 				fprintf(stderr, "%s:%d modulus %s must have a "
    827 				    "value\n", filename, lineno, name);
    828 				return (1);
    829 			}
    830 			break;
    831 		}
    832 		if (mod == NULL || *mod == 0) {
    833 			fprintf(stderr, "%s:%d does not allow %c' %s\n",
    834 			    filename, lineno, *field, name);
    835 			return (1);
    836 		}
    837 		i++;
    838 	}
    839 
    840 	for (; i < fieldlen; i++) {
    841 		if (field[i] < '0' || field[i] > '9') {
    842 			fprintf(stderr, "%s:%d non-digit character in %s\n",
    843 			    filename, lineno, name);
    844 			return (1);
    845 		}
    846 		val = val * 10 + field[i] - '0';
    847 		if (val < 0) {
    848 			fprintf(stderr, "%s:%d %s overflowed\n", filename,
    849 			    lineno, name);
    850 			return (1);
    851 		}
    852 	}
    853 
    854 	if (val > max) {
    855 		fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
    856 		    name, val, max);
    857 		return (1);
    858 	}
    859 	*var = (int)val;
    860 
    861 	return (0);
    862 }
    863 
    864 /* parse the next string in a formatted config file line */
    865 int
    866 get_str(char **line, size_t *len, char **v, const char *name, int minlen,
    867     const char *filename, int lineno)
    868 {
    869 	int fieldlen;
    870 	char *ptr;
    871 
    872 	ptr = get_field(line, len, &fieldlen);
    873 	if (ptr == NULL)
    874 		return (1);
    875 	if (fieldlen < minlen) {
    876 		fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
    877 		return (1);
    878 	}
    879 	if ((*v = malloc(fieldlen + 1)) == NULL) {
    880 		perror("malloc()");
    881 		return (1);
    882 	}
    883 	memcpy(*v, ptr, fieldlen);
    884 	(*v)[fieldlen] = '\0';
    885 
    886 	return (0);
    887 }
    888 
    889 /* Parse out the TCP opts */
    890 int
    891 get_tcpopts(const char *filename, int lineno, const char *tcpopts,
    892     pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
    893     int *wscale_mod, int *ts0)
    894 {
    895 	int i, opt;
    896 
    897 	*packed = 0;
    898 	*optcnt = 0;
    899 	*wscale = 0;
    900 	*wscale_mod = T_DC;
    901 	*mss = 0;
    902 	*mss_mod = T_DC;
    903 	*ts0 = 0;
    904 	if (strcmp(tcpopts, ".") == 0)
    905 		return (0);
    906 
    907 	for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
    908 		switch ((opt = toupper((unsigned char)tcpopts[i++]))) {
    909 		case 'N':	/* FALLTHROUGH */
    910 		case 'S':
    911 			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
    912 			    (opt == 'N' ? PF_OSFP_TCPOPT_NOP :
    913 			    PF_OSFP_TCPOPT_SACK);
    914 			break;
    915 		case 'W':	/* FALLTHROUGH */
    916 		case 'M': {
    917 			int *this_mod, *this;
    918 
    919 			if (opt == 'W') {
    920 				this = wscale;
    921 				this_mod = wscale_mod;
    922 			} else {
    923 				this = mss;
    924 				this_mod = mss_mod;
    925 			}
    926 			*this = 0;
    927 			*this_mod = 0;
    928 
    929 			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
    930 			    (opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
    931 			    PF_OSFP_TCPOPT_MSS);
    932 			if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
    933 			    tcpopts[i + 1] == ',')) {
    934 				*this_mod = T_DC;
    935 				i++;
    936 				break;
    937 			}
    938 
    939 			if (tcpopts[i] == '%') {
    940 				*this_mod = T_MOD;
    941 				i++;
    942 			}
    943 			do {
    944 				if (!isdigit((unsigned char)tcpopts[i])) {
    945 					fprintf(stderr, "%s:%d unknown "
    946 					    "character '%c' in %c TCP opt\n",
    947 					    filename, lineno, tcpopts[i], opt);
    948 					return (1);
    949 				}
    950 				*this = (*this * 10) + tcpopts[i++] - '0';
    951 			} while(tcpopts[i] != ',' && tcpopts[i] != '\0');
    952 			break;
    953 		}
    954 		case 'T':
    955 			if (tcpopts[i] == '0') {
    956 				*ts0 = 1;
    957 				i++;
    958 			}
    959 			*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
    960 			    PF_OSFP_TCPOPT_TS;
    961 			break;
    962 		}
    963 		(*optcnt) ++;
    964 		if (tcpopts[i] == '\0')
    965 			break;
    966 		if (tcpopts[i] != ',') {
    967 			fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
    968 			    filename, lineno, opt);
    969 			return (1);
    970 		}
    971 		i++;
    972 	}
    973 
    974 	return (0);
    975 }
    976 
    977 /* rip the next field ouf of a formatted config file line */
    978 char *
    979 get_field(char **line, size_t *len, int *fieldlen)
    980 {
    981 	char *ret, *ptr = *line;
    982 	size_t plen = *len;
    983 
    984 
    985 	while (plen && isspace((unsigned char)*ptr)) {
    986 		plen--;
    987 		ptr++;
    988 	}
    989 	ret = ptr;
    990 	*fieldlen = 0;
    991 
    992 	for (; plen > 0 && *ptr != ':'; plen--, ptr++)
    993 		(*fieldlen)++;
    994 	if (plen) {
    995 		*line = ptr + 1;
    996 		*len = plen - 1;
    997 	} else {
    998 		*len = 0;
    999 	}
   1000 	while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1]))
   1001 		(*fieldlen)--;
   1002 	return (ret);
   1003 }
   1004 
   1005 
   1006 const char *
   1007 print_ioctl(struct pf_osfp_ioctl *fp)
   1008 {
   1009 	static char buf[1024];
   1010 	char tmp[32];
   1011 	int i, opt;
   1012 
   1013 	*buf = '\0';
   1014 	if (fp->fp_flags & PF_OSFP_WSIZE_DC)
   1015 		strlcat(buf, "*", sizeof(buf));
   1016 	else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
   1017 		strlcat(buf, "S", sizeof(buf));
   1018 	else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
   1019 		strlcat(buf, "T", sizeof(buf));
   1020 	else {
   1021 		if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
   1022 			strlcat(buf, "%", sizeof(buf));
   1023 		snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
   1024 		strlcat(buf, tmp, sizeof(buf));
   1025 	}
   1026 	strlcat(buf, ":", sizeof(buf));
   1027 
   1028 	snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
   1029 	strlcat(buf, tmp, sizeof(buf));
   1030 	strlcat(buf, ":", sizeof(buf));
   1031 
   1032 	if (fp->fp_flags & PF_OSFP_DF)
   1033 		strlcat(buf, "1", sizeof(buf));
   1034 	else
   1035 		strlcat(buf, "0", sizeof(buf));
   1036 	strlcat(buf, ":", sizeof(buf));
   1037 
   1038 	if (fp->fp_flags & PF_OSFP_PSIZE_DC)
   1039 		strlcat(buf, "*", sizeof(buf));
   1040 	else {
   1041 		if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
   1042 			strlcat(buf, "%", sizeof(buf));
   1043 		snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
   1044 		strlcat(buf, tmp, sizeof(buf));
   1045 	}
   1046 	strlcat(buf, ":", sizeof(buf));
   1047 
   1048 	if (fp->fp_optcnt == 0)
   1049 		strlcat(buf, ".", sizeof(buf));
   1050 	for (i = fp->fp_optcnt - 1; i >= 0; i--) {
   1051 		opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
   1052 		opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
   1053 		switch (opt) {
   1054 		case PF_OSFP_TCPOPT_NOP:
   1055 			strlcat(buf, "N", sizeof(buf));
   1056 			break;
   1057 		case PF_OSFP_TCPOPT_SACK:
   1058 			strlcat(buf, "S", sizeof(buf));
   1059 			break;
   1060 		case PF_OSFP_TCPOPT_TS:
   1061 			strlcat(buf, "T", sizeof(buf));
   1062 			if (fp->fp_flags & PF_OSFP_TS0)
   1063 				strlcat(buf, "0", sizeof(buf));
   1064 			break;
   1065 		case PF_OSFP_TCPOPT_MSS:
   1066 			strlcat(buf, "M", sizeof(buf));
   1067 			if (fp->fp_flags & PF_OSFP_MSS_DC)
   1068 				strlcat(buf, "*", sizeof(buf));
   1069 			else {
   1070 				if (fp->fp_flags & PF_OSFP_MSS_MOD)
   1071 					strlcat(buf, "%", sizeof(buf));
   1072 				snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
   1073 				strlcat(buf, tmp, sizeof(buf));
   1074 			}
   1075 			break;
   1076 		case PF_OSFP_TCPOPT_WSCALE:
   1077 			strlcat(buf, "W", sizeof(buf));
   1078 			if (fp->fp_flags & PF_OSFP_WSCALE_DC)
   1079 				strlcat(buf, "*", sizeof(buf));
   1080 			else {
   1081 				if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
   1082 					strlcat(buf, "%", sizeof(buf));
   1083 				snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
   1084 				strlcat(buf, tmp, sizeof(buf));
   1085 			}
   1086 			break;
   1087 		}
   1088 
   1089 		if (i != 0)
   1090 			strlcat(buf, ",", sizeof(buf));
   1091 	}
   1092 	strlcat(buf, ":", sizeof(buf));
   1093 
   1094 	strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
   1095 	strlcat(buf, ":", sizeof(buf));
   1096 	strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
   1097 	strlcat(buf, ":", sizeof(buf));
   1098 	strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
   1099 	strlcat(buf, ":", sizeof(buf));
   1100 
   1101 	snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
   1102 	    (long long int)fp->fp_tcpopts);
   1103 	strlcat(buf, tmp, sizeof(buf));
   1104 
   1105 	return (buf);
   1106 }
   1107