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src/sbin/pfctl/pfctl_osfp.c

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/* $OpenBSD: pfctl_osfp.c,v 1.27 2020/01/15 11:52:50 sashan Exp $ */
/*
* Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <net/if.h>
#include <net/pfvar.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "pfctl_parser.h"
#include "pfctl.h"
#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
/* #define OSFP_DEBUG 1 */
#ifdef OSFP_DEBUG
# define DEBUG(fp, str, v...) \
fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
(fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
#else
# define DEBUG(fp, str, v...) ((void)0)
#endif
struct name_entry;
LIST_HEAD(name_list, name_entry);
struct name_entry {
LIST_ENTRY(name_entry) nm_entry;
int nm_num;
char nm_name[PF_OSFP_LEN];
struct name_list nm_sublist;
int nm_sublist_num;
};
struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
int class_count;
int fingerprint_count;
void add_fingerprint(int, int, struct pf_osfp_ioctl *);
struct name_entry *fingerprint_name_entry(struct name_list *, char *);
void pfctl_flush_my_fingerprints(struct name_list *);
char *get_field(char **, size_t *, int *);
int get_int(char **, size_t *, int *, int *, const char *,
int, int, const char *, int);
int get_str(char **, size_t *, char **, const char *, int,
const char *, int);
int get_tcpopts(const char *, int, const char *,
pf_tcpopts_t *, int *, int *, int *, int *, int *,
int *);
void import_fingerprint(struct pf_osfp_ioctl *);
#ifdef OSFP_DEBUG
const char *print_ioctl(struct pf_osfp_ioctl *);
#endif
void print_name_list(int, struct name_list *, const char *);
void sort_name_list(int, struct name_list *);
struct name_entry *lookup_name_list(struct name_list *, const char *);
/* Load fingerprints from a file */
int
pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
{
FILE *in;
char *line;
size_t len;
int i, lineno = 0;
int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
wscale_mod, optcnt, ts0;
pf_tcpopts_t packed_tcpopts;
char *class, *version, *subtype, *desc, *tcpopts;
struct pf_osfp_ioctl fp;
pfctl_flush_my_fingerprints(&classes);
if ((in = pfctl_fopen(fp_filename, "r")) == NULL) {
warn("%s", fp_filename);
return (1);
}
class = version = subtype = desc = tcpopts = NULL;
if ((opts & PF_OPT_NOACTION) == 0)
pfctl_clear_fingerprints(dev, opts);
while ((line = fgetln(in, &len)) != NULL) {
lineno++;
free(class);
free(version);
free(subtype);
free(desc);
free(tcpopts);
class = version = subtype = desc = tcpopts = NULL;
memset(&fp, 0, sizeof(fp));
/* Chop off comment */
for (i = 0; i < len; i++)
if (line[i] == '#') {
len = i;
break;
}
/* Chop off whitespace */
while (len > 0 && isspace((unsigned char)line[len - 1]))
len--;
while (len > 0 && isspace((unsigned char)line[0])) {
len--;
line++;
}
if (len == 0)
continue;
#define T_DC 0x01 /* Allow don't care */
#define T_MSS 0x02 /* Allow MSS multiple */
#define T_MTU 0x04 /* Allow MTU multiple */
#define T_MOD 0x08 /* Allow modulus */
#define GET_INT(v, mod, n, ty, mx) \
get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
#define GET_STR(v, n, mn) \
get_str(&line, &len, &v, n, mn, fp_filename, lineno)
if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
T_MOD, 0xffff) ||
GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
8192) ||
GET_STR(tcpopts, "TCP Options", 1) ||
GET_STR(class, "OS class", 1) ||
GET_STR(version, "OS version", 0) ||
GET_STR(subtype, "OS subtype", 0) ||
GET_STR(desc, "OS description", 2))
continue;
if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
&optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
continue;
if (len != 0) {
fprintf(stderr, "%s:%d excess field\n", fp_filename,
lineno);
continue;
}
fp.fp_ttl = ttl;
if (df)
fp.fp_flags |= PF_OSFP_DF;
switch (w_mod) {
case 0:
break;
case T_DC:
fp.fp_flags |= PF_OSFP_WSIZE_DC;
break;
case T_MSS:
fp.fp_flags |= PF_OSFP_WSIZE_MSS;
break;
case T_MTU:
fp.fp_flags |= PF_OSFP_WSIZE_MTU;
break;
case T_MOD:
fp.fp_flags |= PF_OSFP_WSIZE_MOD;
break;
}
fp.fp_wsize = window;
switch (p_mod) {
case T_DC:
fp.fp_flags |= PF_OSFP_PSIZE_DC;
break;
case T_MOD:
fp.fp_flags |= PF_OSFP_PSIZE_MOD;
}
fp.fp_psize = psize;
switch (wscale_mod) {
case T_DC:
fp.fp_flags |= PF_OSFP_WSCALE_DC;
break;
case T_MOD:
fp.fp_flags |= PF_OSFP_WSCALE_MOD;
}
fp.fp_wscale = wscale;
switch (mss_mod) {
case T_DC:
fp.fp_flags |= PF_OSFP_MSS_DC;
break;
case T_MOD:
fp.fp_flags |= PF_OSFP_MSS_MOD;
break;
}
fp.fp_mss = mss;
fp.fp_tcpopts = packed_tcpopts;
fp.fp_optcnt = optcnt;
if (ts0)
fp.fp_flags |= PF_OSFP_TS0;
if (class[0] == '@')
fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
if (class[0] == '*')
fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
if (class[0] == '@' || class[0] == '*')
strlcpy(fp.fp_os.fp_class_nm, class + 1,
sizeof(fp.fp_os.fp_class_nm));
else
strlcpy(fp.fp_os.fp_class_nm, class,
sizeof(fp.fp_os.fp_class_nm));
strlcpy(fp.fp_os.fp_version_nm, version,
sizeof(fp.fp_os.fp_version_nm));
strlcpy(fp.fp_os.fp_subtype_nm, subtype,
sizeof(fp.fp_os.fp_subtype_nm));
add_fingerprint(dev, opts, &fp);
fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6);
fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip);
add_fingerprint(dev, opts, &fp);
}
free(class);
free(version);
free(subtype);
free(desc);
free(tcpopts);
fclose(in);
if (opts & PF_OPT_VERBOSE2)
printf("Loaded %d passive OS fingerprints\n",
fingerprint_count);
return (0);
}
/* flush the kernel's fingerprints */
void
pfctl_clear_fingerprints(int dev, int opts)
{
if (ioctl(dev, DIOCOSFPFLUSH) == -1)
pfctl_err(opts, 1, "DIOCOSFPFLUSH");
}
/* flush pfctl's view of the fingerprints */
void
pfctl_flush_my_fingerprints(struct name_list *list)
{
struct name_entry *nm;
while ((nm = LIST_FIRST(list)) != NULL) {
LIST_REMOVE(nm, nm_entry);
pfctl_flush_my_fingerprints(&nm->nm_sublist);
free(nm);
}
fingerprint_count = 0;
class_count = 0;
}
/* Fetch the active fingerprints from the kernel */
int
pfctl_load_fingerprints(int dev, int opts)
{
struct pf_osfp_ioctl io;
int i;
pfctl_flush_my_fingerprints(&classes);
for (i = 0; i >= 0; i++) {
memset(&io, 0, sizeof(io));
io.fp_getnum = i;
if (ioctl(dev, DIOCOSFPGET, &io) == -1) {
if (errno == EBUSY)
break;
warn("DIOCOSFPGET");
return (1);
}
import_fingerprint(&io);
}
return (0);
}
/* List the fingerprints */
void
pfctl_show_fingerprints(int opts)
{
if (LIST_FIRST(&classes) != NULL) {
if (opts & PF_OPT_SHOWALL) {
pfctl_print_title("OS FINGERPRINTS:");
printf("%u fingerprints loaded\n", fingerprint_count);
} else {
printf("Class\tVersion\tSubtype(subversion)\n");
printf("-----\t-------\t-------------------\n");
sort_name_list(opts, &classes);
print_name_list(opts, &classes, "");
}
}
}
/* Lookup a fingerprint */
pf_osfp_t
pfctl_get_fingerprint(const char *name)
{
struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
pf_osfp_t ret = PF_OSFP_NOMATCH;
int class, version, subtype;
int unp_class, unp_version, unp_subtype;
int wr_len, version_len, subtype_len;
char *ptr, *wr_name;
if (strcasecmp(name, "unknown") == 0)
return (PF_OSFP_UNKNOWN);
/* Try most likely no version and no subtype */
if ((nm = lookup_name_list(&classes, name))) {
class = nm->nm_num;
version = PF_OSFP_ANY;
subtype = PF_OSFP_ANY;
goto found;
} else {
/* Chop it up into class/version/subtype */
if ((wr_name = strdup(name)) == NULL)
err(1, "malloc");
if ((ptr = strchr(wr_name, ' ')) == NULL) {
free(wr_name);
return (PF_OSFP_NOMATCH);
}
*ptr++ = '\0';
/* The class is easy to find since it is delimited by a space */
if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
free(wr_name);
return (PF_OSFP_NOMATCH);
}
class = class_nm->nm_num;
/* Try no subtype */
if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
{
version = version_nm->nm_num;
subtype = PF_OSFP_ANY;
free(wr_name);
goto found;
}
/*
* There must be a version and a subtype.
* We'll do some fuzzy matching to pick up things like:
* Linux 2.2.14 (version=2.2 subtype=14)
* FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
* Windows 2000 SP2 (version=2000 subtype=SP2)
*/
#define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
wr_len = strlen(ptr);
LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
version_len = strlen(version_nm->nm_name);
if (wr_len < version_len + 2 ||
!CONNECTOR(ptr[version_len]))
continue;
/* first part of the string must be version */
if (strncasecmp(ptr, version_nm->nm_name,
version_len))
continue;
LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
nm_entry) {
subtype_len = strlen(subtype_nm->nm_name);
if (wr_len != version_len + subtype_len + 1)
continue;
/* last part of the string must be subtype */
if (strcasecmp(&ptr[version_len+1],
subtype_nm->nm_name) != 0)
continue;
/* Found it!! */
version = version_nm->nm_num;
subtype = subtype_nm->nm_num;
free(wr_name);
goto found;
}
}
free(wr_name);
return (PF_OSFP_NOMATCH);
}
found:
PF_OSFP_PACK(ret, class, version, subtype);
if (ret != PF_OSFP_NOMATCH) {
PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
if (class != unp_class) {
fprintf(stderr, "warning: fingerprint table overflowed "
"classes\n");
return (PF_OSFP_NOMATCH);
}
if (version != unp_version) {
fprintf(stderr, "warning: fingerprint table overflowed "
"versions\n");
return (PF_OSFP_NOMATCH);
}
if (subtype != unp_subtype) {
fprintf(stderr, "warning: fingerprint table overflowed "
"subtypes\n");
return (PF_OSFP_NOMATCH);
}
}
if (ret == PF_OSFP_ANY) {
/* should never happen */
fprintf(stderr, "warning: fingerprint packed to 'any'\n");
return (PF_OSFP_NOMATCH);
}
return (ret);
}
/* Lookup a fingerprint name by ID */
char *
pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
{
int class, version, subtype;
struct name_list *list;
struct name_entry *nm;
char *class_name, *version_name, *subtype_name;
class_name = version_name = subtype_name = NULL;
if (fp == PF_OSFP_UNKNOWN) {
strlcpy(buf, "unknown", len);
return (buf);
}
if (fp == PF_OSFP_ANY) {
strlcpy(buf, "any", len);
return (buf);
}
PF_OSFP_UNPACK(fp, class, version, subtype);
if (class >= (1 << _FP_CLASS_BITS) ||
version >= (1 << _FP_VERSION_BITS) ||
subtype >= (1 << _FP_SUBTYPE_BITS)) {
warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
strlcpy(buf, "nomatch", len);
return (buf);
}
LIST_FOREACH(nm, &classes, nm_entry) {
if (nm->nm_num == class) {
class_name = nm->nm_name;
if (version == PF_OSFP_ANY)
goto found;
list = &nm->nm_sublist;
LIST_FOREACH(nm, list, nm_entry) {
if (nm->nm_num == version) {
version_name = nm->nm_name;
if (subtype == PF_OSFP_ANY)
goto found;
list = &nm->nm_sublist;
LIST_FOREACH(nm, list, nm_entry) {
if (nm->nm_num == subtype) {
subtype_name =
nm->nm_name;
goto found;
}
} /* foreach subtype */
strlcpy(buf, "nomatch", len);
return (buf);
}
} /* foreach version */
strlcpy(buf, "nomatch", len);
return (buf);
}
} /* foreach class */
strlcpy(buf, "nomatch", len);
return (buf);
found:
snprintf(buf, len, "%s", class_name);
if (version_name) {
strlcat(buf, " ", len);
strlcat(buf, version_name, len);
if (subtype_name) {
if (strchr(version_name, ' '))
strlcat(buf, " ", len);
else if (strchr(version_name, '.') &&
isdigit((unsigned char)*subtype_name))
strlcat(buf, ".", len);
else
strlcat(buf, " ", len);
strlcat(buf, subtype_name, len);
}
}
return (buf);
}
/* lookup a name in a list */
struct name_entry *
lookup_name_list(struct name_list *list, const char *name)
{
struct name_entry *nm;
LIST_FOREACH(nm, list, nm_entry)
if (strcasecmp(name, nm->nm_name) == 0)
return (nm);
return (NULL);
}
void
add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
{
struct pf_osfp_ioctl fptmp;
struct name_entry *nm_class, *nm_version, *nm_subtype;
int class, version, subtype;
/* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
#define EXPAND(field) do { \
int _dot = -1, _start = -1, _end = -1, _i = 0; \
/* pick major version out of #.# */ \
if (isdigit((unsigned char)fp->field[_i]) && \
fp->field[_i+1] == '.') { \
_dot = fp->field[_i] - '0'; \
_i += 2; \
} \
if (isdigit((unsigned char)fp->field[_i])) \
_start = fp->field[_i++] - '0'; \
else \
break; \
if (isdigit((unsigned char)fp->field[_i])) \
_start = (_start * 10) + fp->field[_i++] - '0'; \
if (fp->field[_i++] != '-') \
break; \
if (isdigit((unsigned char)fp->field[_i]) && \
fp->field[_i+1] == '.' && fp->field[_i] - '0' == _dot) \
_i += 2; \
else if (_dot != -1) \
break; \
if (isdigit((unsigned char)fp->field[_i])) \
_end = fp->field[_i++] - '0'; \
else \
break; \
if (isdigit((unsigned char)fp->field[_i])) \
_end = (_end * 10) + fp->field[_i++] - '0'; \
if (isdigit((unsigned char)fp->field[_i])) \
_end = (_end * 10) + fp->field[_i++] - '0'; \
if (fp->field[_i] != '\0') \
break; \
memcpy(&fptmp, fp, sizeof(fptmp)); \
for (;_start <= _end; _start++) { \
memset(fptmp.field, 0, sizeof(fptmp.field)); \
fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \
if (_dot == -1) \
snprintf(fptmp.field, sizeof(fptmp.field), \
"%d", _start); \
else \
snprintf(fptmp.field, sizeof(fptmp.field), \
"%d.%d", _dot, _start); \
add_fingerprint(dev, opts, &fptmp); \
} \
} while(0)
/* We allow "#-#" as a version or subtype and we'll expand it */
EXPAND(fp_os.fp_version_nm);
EXPAND(fp_os.fp_subtype_nm);
if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
errx(1, "fingerprint class \"nomatch\" is reserved");
version = PF_OSFP_ANY;
subtype = PF_OSFP_ANY;
nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
if (nm_class->nm_num == 0)
nm_class->nm_num = ++class_count;
class = nm_class->nm_num;
nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
fp->fp_os.fp_version_nm);
if (nm_version) {
if (nm_version->nm_num == 0)
nm_version->nm_num = ++nm_class->nm_sublist_num;
version = nm_version->nm_num;
nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
fp->fp_os.fp_subtype_nm);
if (nm_subtype) {
if (nm_subtype->nm_num == 0)
nm_subtype->nm_num =
++nm_version->nm_sublist_num;
subtype = nm_subtype->nm_num;
}
}
DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
print_ioctl(fp));
PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
fingerprint_count++;
#ifdef FAKE_PF_KERNEL
/* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */
if ((errno = pf_osfp_add(fp)))
#else
if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp) == -1)
#endif /* FAKE_PF_KERNEL */
{
if (errno == EEXIST) {
warn("Duplicate signature for %s %s %s",
fp->fp_os.fp_class_nm,
fp->fp_os.fp_version_nm,
fp->fp_os.fp_subtype_nm);
} else {
err(1, "DIOCOSFPADD");
}
}
}
/* import a fingerprint from the kernel */
void
import_fingerprint(struct pf_osfp_ioctl *fp)
{
struct name_entry *nm_class, *nm_version, *nm_subtype;
int class, version, subtype;
PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
if (nm_class->nm_num == 0) {
nm_class->nm_num = class;
class_count = MAXIMUM(class_count, class);
}
nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
fp->fp_os.fp_version_nm);
if (nm_version) {
if (nm_version->nm_num == 0) {
nm_version->nm_num = version;
nm_class->nm_sublist_num = MAXIMUM(nm_class->nm_sublist_num,
version);
}
nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
fp->fp_os.fp_subtype_nm);
if (nm_subtype) {
if (nm_subtype->nm_num == 0) {
nm_subtype->nm_num = subtype;
nm_version->nm_sublist_num =
MAXIMUM(nm_version->nm_sublist_num, subtype);
}
}
}
fingerprint_count++;
DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
}
/* Find an entry for a fingerprints class/version/subtype */
struct name_entry *
fingerprint_name_entry(struct name_list *list, char *name)
{
struct name_entry *nm_entry;
if (name == NULL || strlen(name) == 0)
return (NULL);
LIST_FOREACH(nm_entry, list, nm_entry) {
if (strcasecmp(nm_entry->nm_name, name) == 0) {
/* We'll move this to the front of the list later */
LIST_REMOVE(nm_entry, nm_entry);
break;
}
}
if (nm_entry == NULL) {
nm_entry = calloc(1, sizeof(*nm_entry));
if (nm_entry == NULL)
err(1, "calloc");
LIST_INIT(&nm_entry->nm_sublist);
strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
}
LIST_INSERT_HEAD(list, nm_entry, nm_entry);
return (nm_entry);
}
void
print_name_list(int opts, struct name_list *nml, const char *prefix)
{
char newprefix[32];
struct name_entry *nm;
LIST_FOREACH(nm, nml, nm_entry) {
snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
nm->nm_name);
printf("%s\n", newprefix);
print_name_list(opts, &nm->nm_sublist, newprefix);
}
}
void
sort_name_list(int opts, struct name_list *nml)
{
struct name_list new;
struct name_entry *nm, *nmsearch, *nmlast;
/* yes yes, it's a very slow sort. so sue me */
LIST_INIT(&new);
while ((nm = LIST_FIRST(nml)) != NULL) {
LIST_REMOVE(nm, nm_entry);
nmlast = NULL;
LIST_FOREACH(nmsearch, &new, nm_entry) {
if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
break;
}
nmlast = nmsearch;
}
if (nmsearch == NULL) {
if (nmlast)
LIST_INSERT_AFTER(nmlast, nm, nm_entry);
else
LIST_INSERT_HEAD(&new, nm, nm_entry);
}
sort_name_list(opts, &nm->nm_sublist);
}
nmlast = NULL;
while ((nm = LIST_FIRST(&new)) != NULL) {
LIST_REMOVE(nm, nm_entry);
if (nmlast == NULL)
LIST_INSERT_HEAD(nml, nm, nm_entry);
else
LIST_INSERT_AFTER(nmlast, nm, nm_entry);
nmlast = nm;
}
}
/* parse the next integer in a formatted config file line */
int
get_int(char **line, size_t *len, int *var, int *mod,
const char *name, int flags, int max, const char *filename, int lineno)
{
int fieldlen, i;
char *field;
long val = 0;
if (mod)
*mod = 0;
*var = 0;
field = get_field(line, len, &fieldlen);
if (field == NULL)
return (1);
if (fieldlen == 0) {
fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
return (1);
}
i = 0;
if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
&& fieldlen >= 1) {
switch (*field) {
case 'S':
if (mod && (flags & T_MSS))
*mod = T_MSS;
if (fieldlen == 1)
return (0);
break;
case 'T':
if (mod && (flags & T_MTU))
*mod = T_MTU;
if (fieldlen == 1)
return (0);
break;
case '*':
if (fieldlen != 1) {
fprintf(stderr, "%s:%d long '%c' %s\n",
filename, lineno, *field, name);
return (1);
}
if (mod && (flags & T_DC)) {
*mod = T_DC;
return (0);
}
case '%':
if (mod && (flags & T_MOD))
*mod = T_MOD;
if (fieldlen == 1) {
fprintf(stderr, "%s:%d modulus %s must have a "
"value\n", filename, lineno, name);
return (1);
}
break;
}
if (mod == NULL || *mod == 0) {
fprintf(stderr, "%s:%d does not allow %c' %s\n",
filename, lineno, *field, name);
return (1);
}
i++;
}
for (; i < fieldlen; i++) {
if (field[i] < '0' || field[i] > '9') {
fprintf(stderr, "%s:%d non-digit character in %s\n",
filename, lineno, name);
return (1);
}
val = val * 10 + field[i] - '0';
if (val < 0) {
fprintf(stderr, "%s:%d %s overflowed\n", filename,
lineno, name);
return (1);
}
}
if (val > max) {
fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
name, val, max);
return (1);
}
*var = (int)val;
return (0);
}
/* parse the next string in a formatted config file line */
int
get_str(char **line, size_t *len, char **v, const char *name, int minlen,
const char *filename, int lineno)
{
int fieldlen;
char *ptr;
ptr = get_field(line, len, &fieldlen);
if (ptr == NULL)
return (1);
if (fieldlen < minlen) {
fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
return (1);
}
if ((*v = malloc(fieldlen + 1)) == NULL) {
perror("malloc()");
return (1);
}
memcpy(*v, ptr, fieldlen);
(*v)[fieldlen] = '\0';
return (0);
}
/* Parse out the TCP opts */
int
get_tcpopts(const char *filename, int lineno, const char *tcpopts,
pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
int *wscale_mod, int *ts0)
{
int i, opt;
*packed = 0;
*optcnt = 0;
*wscale = 0;
*wscale_mod = T_DC;
*mss = 0;
*mss_mod = T_DC;
*ts0 = 0;
if (strcmp(tcpopts, ".") == 0)
return (0);
for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
switch ((opt = toupper((unsigned char)tcpopts[i++]))) {
case 'N': /* FALLTHROUGH */
case 'S':
*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
(opt == 'N' ? PF_OSFP_TCPOPT_NOP :
PF_OSFP_TCPOPT_SACK);
break;
case 'W': /* FALLTHROUGH */
case 'M': {
int *this_mod, *this;
if (opt == 'W') {
this = wscale;
this_mod = wscale_mod;
} else {
this = mss;
this_mod = mss_mod;
}
*this = 0;
*this_mod = 0;
*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
(opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
PF_OSFP_TCPOPT_MSS);
if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
tcpopts[i + 1] == ',')) {
*this_mod = T_DC;
i++;
break;
}
if (tcpopts[i] == '%') {
*this_mod = T_MOD;
i++;
}
do {
if (!isdigit((unsigned char)tcpopts[i])) {
fprintf(stderr, "%s:%d unknown "
"character '%c' in %c TCP opt\n",
filename, lineno, tcpopts[i], opt);
return (1);
}
*this = (*this * 10) + tcpopts[i++] - '0';
} while(tcpopts[i] != ',' && tcpopts[i] != '\0');
break;
}
case 'T':
if (tcpopts[i] == '0') {
*ts0 = 1;
i++;
}
*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
PF_OSFP_TCPOPT_TS;
break;
}
(*optcnt) ++;
if (tcpopts[i] == '\0')
break;
if (tcpopts[i] != ',') {
fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
filename, lineno, opt);
return (1);
}
i++;
}
return (0);
}
/* rip the next field out of a formatted config file line */
char *
get_field(char **line, size_t *len, int *fieldlen)
{
char *ret, *ptr = *line;
size_t plen = *len;
while (plen && isspace((unsigned char)*ptr)) {
plen--;
ptr++;
}
ret = ptr;
*fieldlen = 0;
for (; plen > 0 && *ptr != ':'; plen--, ptr++)
(*fieldlen)++;
if (plen) {
*line = ptr + 1;
*len = plen - 1;
} else {
*len = 0;
}
while (*fieldlen && isspace((unsigned char)ret[*fieldlen - 1]))
(*fieldlen)--;
return (ret);
}
#ifdef OSFP_DEBUG
const char *
print_ioctl(struct pf_osfp_ioctl *fp)
{
static char buf[1024];
char tmp[32];
int i, opt;
*buf = '\0';
if (fp->fp_flags & PF_OSFP_WSIZE_DC)
strlcat(buf, "*", sizeof(buf));
else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
strlcat(buf, "S", sizeof(buf));
else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
strlcat(buf, "T", sizeof(buf));
else {
if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
strlcat(buf, "%", sizeof(buf));
snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
strlcat(buf, tmp, sizeof(buf));
}
strlcat(buf, ":", sizeof(buf));
snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
strlcat(buf, tmp, sizeof(buf));
strlcat(buf, ":", sizeof(buf));
if (fp->fp_flags & PF_OSFP_DF)
strlcat(buf, "1", sizeof(buf));
else
strlcat(buf, "0", sizeof(buf));
strlcat(buf, ":", sizeof(buf));
if (fp->fp_flags & PF_OSFP_PSIZE_DC)
strlcat(buf, "*", sizeof(buf));
else {
if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
strlcat(buf, "%", sizeof(buf));
snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
strlcat(buf, tmp, sizeof(buf));
}
strlcat(buf, ":", sizeof(buf));
if (fp->fp_optcnt == 0)
strlcat(buf, ".", sizeof(buf));
for (i = fp->fp_optcnt - 1; i >= 0; i--) {
opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
switch (opt) {
case PF_OSFP_TCPOPT_NOP:
strlcat(buf, "N", sizeof(buf));
break;
case PF_OSFP_TCPOPT_SACK:
strlcat(buf, "S", sizeof(buf));
break;
case PF_OSFP_TCPOPT_TS:
strlcat(buf, "T", sizeof(buf));
if (fp->fp_flags & PF_OSFP_TS0)
strlcat(buf, "0", sizeof(buf));
break;
case PF_OSFP_TCPOPT_MSS:
strlcat(buf, "M", sizeof(buf));
if (fp->fp_flags & PF_OSFP_MSS_DC)
strlcat(buf, "*", sizeof(buf));
else {
if (fp->fp_flags & PF_OSFP_MSS_MOD)
strlcat(buf, "%", sizeof(buf));
snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
strlcat(buf, tmp, sizeof(buf));
}
break;
case PF_OSFP_TCPOPT_WSCALE:
strlcat(buf, "W", sizeof(buf));
if (fp->fp_flags & PF_OSFP_WSCALE_DC)
strlcat(buf, "*", sizeof(buf));
else {
if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
strlcat(buf, "%", sizeof(buf));
snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
strlcat(buf, tmp, sizeof(buf));
}
break;
}
if (i != 0)
strlcat(buf, ",", sizeof(buf));
}
strlcat(buf, ":", sizeof(buf));
strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
strlcat(buf, ":", sizeof(buf));
strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
strlcat(buf, ":", sizeof(buf));
strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
strlcat(buf, ":", sizeof(buf));
snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
(long long int)fp->fp_tcpopts);
strlcat(buf, tmp, sizeof(buf));
return (buf);
}
#endif
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