cc7e902276
Also set HOOK_HACK to true (remove the related #ifdef's) as we have the hooks in the kernel this was missed during the merge from the port. Noticed by: Amir S. (for the HOOK_HACK part) Approved by: bms(mentor)
564 lines
15 KiB
C
564 lines
15 KiB
C
/* $FreeBSD$ */
|
|
/* $OpenBSD: pf_osfp.c,v 1.3 2003/08/27 18:23:36 frantzen Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2003 Mike Frantzen <frantzen@w4g.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/param.h>
|
|
#include <sys/socket.h>
|
|
#ifdef _KERNEL
|
|
# include <sys/systm.h>
|
|
#endif /* _KERNEL */
|
|
#include <sys/mbuf.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <netinet/tcp.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/pfvar.h>
|
|
|
|
#ifdef INET6
|
|
#include <netinet/ip6.h>
|
|
#endif /* INET6 */
|
|
|
|
#ifdef _KERNEL
|
|
# define DPFPRINTF(format, x...) \
|
|
if (pf_status.debug >= PF_DEBUG_NOISY) \
|
|
printf(format , ##x)
|
|
#ifdef __FreeBSD__
|
|
typedef uma_zone_t pool_t;
|
|
#else
|
|
typedef struct pool pool_t;
|
|
#endif
|
|
|
|
#else
|
|
/* Userland equivalents so we can lend code to tcpdump et al. */
|
|
|
|
# include <arpa/inet.h>
|
|
# include <errno.h>
|
|
# include <stdio.h>
|
|
# include <stdlib.h>
|
|
# define pool_t int
|
|
# define pool_get(pool, flags) malloc(*(pool))
|
|
# define pool_put(pool, item) free(item)
|
|
# define pool_init(pool, size, a, ao, f, m, p) (*(pool)) = (size)
|
|
|
|
# ifdef __FreeBSD__
|
|
# define NTOHS(x) (x) = ntohs((u_int16_t)(x))
|
|
# endif
|
|
|
|
# ifdef PFDEBUG
|
|
# include <stdarg.h>
|
|
# define DPFPRINTF(format, x...) fprintf(stderr, format , ##x)
|
|
# else
|
|
# define DPFPRINTF(format, x...) ((void)0)
|
|
# endif /* PFDEBUG */
|
|
#endif /* _KERNEL */
|
|
|
|
|
|
SLIST_HEAD(pf_osfp_list, pf_os_fingerprint) pf_osfp_list;
|
|
pool_t pf_osfp_entry_pl;
|
|
pool_t pf_osfp_pl;
|
|
|
|
struct pf_os_fingerprint *pf_osfp_find(struct pf_osfp_list *,
|
|
struct pf_os_fingerprint *, u_int8_t);
|
|
struct pf_os_fingerprint *pf_osfp_find_exact(struct pf_osfp_list *,
|
|
struct pf_os_fingerprint *);
|
|
void pf_osfp_insert(struct pf_osfp_list *,
|
|
struct pf_os_fingerprint *);
|
|
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Passively fingerprint the OS of the host (IPv4 TCP SYN packets only)
|
|
* Returns the list of possible OSes.
|
|
*/
|
|
struct pf_osfp_enlist *
|
|
pf_osfp_fingerprint(struct pf_pdesc *pd, struct mbuf *m, int off,
|
|
const struct tcphdr *tcp)
|
|
{
|
|
struct ip *ip;
|
|
char hdr[60];
|
|
|
|
/* XXX don't have a fingerprint database for IPv6 :-( */
|
|
if (pd->af != PF_INET || pd->proto != IPPROTO_TCP || (tcp->th_off << 2)
|
|
< sizeof(*tcp))
|
|
return (NULL);
|
|
|
|
ip = mtod(m, struct ip *);
|
|
if (!pf_pull_hdr(m, off, hdr, tcp->th_off << 2, NULL, NULL, pd->af))
|
|
return (NULL);
|
|
|
|
return (pf_osfp_fingerprint_hdr(ip, (struct tcphdr *)hdr));
|
|
}
|
|
#endif /* _KERNEL */
|
|
|
|
struct pf_osfp_enlist *
|
|
pf_osfp_fingerprint_hdr(const struct ip *ip, const struct tcphdr *tcp)
|
|
{
|
|
struct pf_os_fingerprint fp, *fpresult;
|
|
int cnt, optlen = 0;
|
|
const u_int8_t *optp;
|
|
|
|
if ((tcp->th_flags & (TH_SYN|TH_ACK)) != TH_SYN || (ip->ip_off &
|
|
htons(IP_OFFMASK)))
|
|
return (NULL);
|
|
|
|
memset(&fp, 0, sizeof(fp));
|
|
|
|
fp.fp_psize = ntohs(ip->ip_len);
|
|
fp.fp_ttl = ip->ip_ttl;
|
|
if (ip->ip_off & htons(IP_DF))
|
|
fp.fp_flags |= PF_OSFP_DF;
|
|
fp.fp_wsize = ntohs(tcp->th_win);
|
|
|
|
|
|
cnt = (tcp->th_off << 2) - sizeof(*tcp);
|
|
optp = (const u_int8_t *)((const char *)tcp + sizeof(*tcp));
|
|
for (; cnt > 0; cnt -= optlen, optp += optlen) {
|
|
if (*optp == TCPOPT_EOL)
|
|
break;
|
|
|
|
fp.fp_optcnt++;
|
|
if (*optp == TCPOPT_NOP) {
|
|
fp.fp_tcpopts = (fp.fp_tcpopts << PF_OSFP_TCPOPT_BITS) |
|
|
PF_OSFP_TCPOPT_NOP;
|
|
optlen = 1;
|
|
} else {
|
|
if (cnt < 2)
|
|
return (NULL);
|
|
optlen = optp[1];
|
|
if (optlen > cnt || optlen < 2)
|
|
return (NULL);
|
|
switch (*optp) {
|
|
case TCPOPT_MAXSEG:
|
|
if (optlen >= TCPOLEN_MAXSEG)
|
|
memcpy(&fp.fp_mss, &optp[2],
|
|
sizeof(fp.fp_mss));
|
|
fp.fp_tcpopts = (fp.fp_tcpopts <<
|
|
PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_MSS;
|
|
NTOHS(fp.fp_mss);
|
|
break;
|
|
case TCPOPT_WINDOW:
|
|
if (optlen >= TCPOLEN_WINDOW)
|
|
memcpy(&fp.fp_wscale, &optp[2],
|
|
sizeof(fp.fp_wscale));
|
|
NTOHS(fp.fp_wscale);
|
|
fp.fp_tcpopts = (fp.fp_tcpopts <<
|
|
PF_OSFP_TCPOPT_BITS) |
|
|
PF_OSFP_TCPOPT_WSCALE;
|
|
break;
|
|
case TCPOPT_SACK_PERMITTED:
|
|
fp.fp_tcpopts = (fp.fp_tcpopts <<
|
|
PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_SACK;
|
|
break;
|
|
case TCPOPT_TIMESTAMP:
|
|
if (optlen >= TCPOLEN_TIMESTAMP) {
|
|
u_int32_t ts;
|
|
memcpy(&ts, &optp[2], sizeof(ts));
|
|
if (ts == 0)
|
|
fp.fp_flags |= PF_OSFP_TS0;
|
|
|
|
}
|
|
fp.fp_tcpopts = (fp.fp_tcpopts <<
|
|
PF_OSFP_TCPOPT_BITS) | PF_OSFP_TCPOPT_TS;
|
|
break;
|
|
default:
|
|
return (NULL);
|
|
}
|
|
}
|
|
optlen = MAX(optlen, 1); /* paranoia */
|
|
}
|
|
|
|
DPFPRINTF("fingerprinted %s:%d %d:%d:%d:%d:%llx (%d) "
|
|
"(TS=%s,M=%s%d,W=%s%d)\n",
|
|
inet_ntoa(ip->ip_src), ntohs(tcp->th_sport),
|
|
fp.fp_wsize, fp.fp_ttl, (fp.fp_flags & PF_OSFP_DF) != 0,
|
|
fp.fp_psize, (long long int)fp.fp_tcpopts, fp.fp_optcnt,
|
|
(fp.fp_flags & PF_OSFP_TS0) ? "0" : "",
|
|
(fp.fp_flags & PF_OSFP_MSS_MOD) ? "%" :
|
|
(fp.fp_flags & PF_OSFP_MSS_DC) ? "*" : "",
|
|
fp.fp_mss,
|
|
(fp.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" :
|
|
(fp.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "",
|
|
fp.fp_wscale);
|
|
|
|
if ((fpresult = pf_osfp_find(&pf_osfp_list, &fp,
|
|
PF_OSFP_MAXTTL_OFFSET)))
|
|
return (&fpresult->fp_oses);
|
|
return (NULL);
|
|
}
|
|
|
|
/* Match a fingerprint ID against a list of OSes */
|
|
int
|
|
pf_osfp_match(struct pf_osfp_enlist *list, pf_osfp_t os)
|
|
{
|
|
struct pf_osfp_entry *entry;
|
|
int os_class, os_version, os_subtype;
|
|
int en_class, en_version, en_subtype;
|
|
|
|
if (os == PF_OSFP_ANY)
|
|
return (1);
|
|
if (list == NULL) {
|
|
DPFPRINTF("osfp no match against %x\n", os);
|
|
return (os == PF_OSFP_UNKNOWN);
|
|
}
|
|
PF_OSFP_UNPACK(os, os_class, os_version, os_subtype);
|
|
SLIST_FOREACH(entry, list, fp_entry) {
|
|
PF_OSFP_UNPACK(entry->fp_os, en_class, en_version, en_subtype);
|
|
if ((os_class == PF_OSFP_ANY || en_class == os_class) &&
|
|
(os_version == PF_OSFP_ANY || en_version == os_version) &&
|
|
(os_subtype == PF_OSFP_ANY || en_subtype == os_subtype)) {
|
|
DPFPRINTF("osfp matched %s %s %s %x==%x\n",
|
|
entry->fp_class_nm, entry->fp_version_nm,
|
|
entry->fp_subtype_nm, os, entry->fp_os);
|
|
return (1);
|
|
}
|
|
}
|
|
DPFPRINTF("fingerprint 0x%x didn't match\n", os);
|
|
return (0);
|
|
}
|
|
|
|
/* Initialize the OS fingerprint system */
|
|
#ifdef __FreeBSD__
|
|
int
|
|
#else
|
|
void
|
|
#endif
|
|
pf_osfp_initialize(void)
|
|
{
|
|
#if defined(__FreeBSD__) && defined(_KERNEL)
|
|
int error = ENOMEM;
|
|
|
|
do {
|
|
pf_osfp_entry_pl = pf_osfp_pl = NULL;
|
|
UMA_CREATE(pf_osfp_entry_pl, struct pf_osfp_entry, "pfospfen");
|
|
UMA_CREATE(pf_osfp_pl, struct pf_os_fingerprint, "pfosfp");
|
|
error = 0;
|
|
} while(0);
|
|
#else
|
|
pool_init(&pf_osfp_entry_pl, sizeof(struct pf_osfp_entry), 0, 0, 0,
|
|
"pfosfpen", NULL);
|
|
pool_init(&pf_osfp_pl, sizeof(struct pf_os_fingerprint), 0, 0, 0,
|
|
"pfosfp", NULL);
|
|
#endif
|
|
SLIST_INIT(&pf_osfp_list);
|
|
#ifdef __FreeBSD__
|
|
#ifdef _KERNEL
|
|
return (error);
|
|
#else
|
|
return (0);
|
|
#endif
|
|
#endif
|
|
}
|
|
|
|
#if defined(__FreeBSD__) && (_KERNEL)
|
|
void
|
|
pf_osfp_cleanup(void)
|
|
{
|
|
UMA_DESTROY(pf_osfp_entry_pl);
|
|
UMA_DESTROY(pf_osfp_pl);
|
|
}
|
|
#endif
|
|
|
|
/* Flush the fingerprint list */
|
|
void
|
|
pf_osfp_flush(void)
|
|
{
|
|
struct pf_os_fingerprint *fp;
|
|
struct pf_osfp_entry *entry;
|
|
|
|
while ((fp = SLIST_FIRST(&pf_osfp_list))) {
|
|
SLIST_REMOVE_HEAD(&pf_osfp_list, fp_next);
|
|
while ((entry = SLIST_FIRST(&fp->fp_oses))) {
|
|
SLIST_REMOVE_HEAD(&fp->fp_oses, fp_entry);
|
|
pool_put(&pf_osfp_entry_pl, entry);
|
|
}
|
|
pool_put(&pf_osfp_pl, fp);
|
|
}
|
|
}
|
|
|
|
|
|
/* Add a fingerprint */
|
|
int
|
|
pf_osfp_add(struct pf_osfp_ioctl *fpioc)
|
|
{
|
|
struct pf_os_fingerprint *fp, fpadd;
|
|
struct pf_osfp_entry *entry;
|
|
|
|
memset(&fpadd, 0, sizeof(fpadd));
|
|
fpadd.fp_tcpopts = fpioc->fp_tcpopts;
|
|
fpadd.fp_wsize = fpioc->fp_wsize;
|
|
fpadd.fp_psize = fpioc->fp_psize;
|
|
fpadd.fp_mss = fpioc->fp_mss;
|
|
fpadd.fp_flags = fpioc->fp_flags;
|
|
fpadd.fp_optcnt = fpioc->fp_optcnt;
|
|
fpadd.fp_wscale = fpioc->fp_wscale;
|
|
fpadd.fp_ttl = fpioc->fp_ttl;
|
|
|
|
DPFPRINTF("adding osfp %s %s %s = %s%d:%d:%d:%s%d:0x%llx %d "
|
|
"(TS=%s,M=%s%d,W=%s%d) %x\n",
|
|
fpioc->fp_os.fp_class_nm, fpioc->fp_os.fp_version_nm,
|
|
fpioc->fp_os.fp_subtype_nm,
|
|
(fpadd.fp_flags & PF_OSFP_WSIZE_MOD) ? "%" :
|
|
(fpadd.fp_flags & PF_OSFP_WSIZE_MSS) ? "S" :
|
|
(fpadd.fp_flags & PF_OSFP_WSIZE_MTU) ? "T" :
|
|
(fpadd.fp_flags & PF_OSFP_WSIZE_DC) ? "*" : "",
|
|
fpadd.fp_wsize,
|
|
fpadd.fp_ttl,
|
|
(fpadd.fp_flags & PF_OSFP_DF) ? 1 : 0,
|
|
(fpadd.fp_flags & PF_OSFP_PSIZE_MOD) ? "%" :
|
|
(fpadd.fp_flags & PF_OSFP_PSIZE_DC) ? "*" : "",
|
|
fpadd.fp_psize,
|
|
(long long int)fpadd.fp_tcpopts, fpadd.fp_optcnt,
|
|
(fpadd.fp_flags & PF_OSFP_TS0) ? "0" : "",
|
|
(fpadd.fp_flags & PF_OSFP_MSS_MOD) ? "%" :
|
|
(fpadd.fp_flags & PF_OSFP_MSS_DC) ? "*" : "",
|
|
fpadd.fp_mss,
|
|
(fpadd.fp_flags & PF_OSFP_WSCALE_MOD) ? "%" :
|
|
(fpadd.fp_flags & PF_OSFP_WSCALE_DC) ? "*" : "",
|
|
fpadd.fp_wscale,
|
|
fpioc->fp_os.fp_os);
|
|
|
|
|
|
if ((fp = pf_osfp_find_exact(&pf_osfp_list, &fpadd))) {
|
|
SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
|
|
if (PF_OSFP_ENTRY_EQ(entry, &fpioc->fp_os))
|
|
return (EEXIST);
|
|
}
|
|
if ((entry = pool_get(&pf_osfp_entry_pl, PR_NOWAIT)) == NULL)
|
|
return (ENOMEM);
|
|
} else {
|
|
if ((fp = pool_get(&pf_osfp_pl, PR_NOWAIT)) == NULL)
|
|
return (ENOMEM);
|
|
memset(fp, 0, sizeof(*fp));
|
|
fp->fp_tcpopts = fpioc->fp_tcpopts;
|
|
fp->fp_wsize = fpioc->fp_wsize;
|
|
fp->fp_psize = fpioc->fp_psize;
|
|
fp->fp_mss = fpioc->fp_mss;
|
|
fp->fp_flags = fpioc->fp_flags;
|
|
fp->fp_optcnt = fpioc->fp_optcnt;
|
|
fp->fp_wscale = fpioc->fp_wscale;
|
|
fp->fp_ttl = fpioc->fp_ttl;
|
|
SLIST_INIT(&fp->fp_oses);
|
|
if ((entry = pool_get(&pf_osfp_entry_pl, PR_NOWAIT)) == NULL) {
|
|
pool_put(&pf_osfp_pl, fp);
|
|
return (ENOMEM);
|
|
}
|
|
pf_osfp_insert(&pf_osfp_list, fp);
|
|
}
|
|
memcpy(entry, &fpioc->fp_os, sizeof(*entry));
|
|
|
|
/* Make sure the strings are NUL terminated */
|
|
entry->fp_class_nm[sizeof(entry->fp_class_nm)-1] = '\0';
|
|
entry->fp_version_nm[sizeof(entry->fp_version_nm)-1] = '\0';
|
|
entry->fp_subtype_nm[sizeof(entry->fp_subtype_nm)-1] = '\0';
|
|
|
|
SLIST_INSERT_HEAD(&fp->fp_oses, entry, fp_entry);
|
|
|
|
#ifdef PFDEBUG
|
|
if ((fp = pf_osfp_validate()))
|
|
printf("Invalid fingerprint list\n");
|
|
#endif /* PFDEBUG */
|
|
return (0);
|
|
}
|
|
|
|
|
|
/* Find a fingerprint in the list */
|
|
struct pf_os_fingerprint *
|
|
pf_osfp_find(struct pf_osfp_list *list, struct pf_os_fingerprint *find,
|
|
u_int8_t ttldiff)
|
|
{
|
|
struct pf_os_fingerprint *f;
|
|
|
|
#define MATCH_INT(_MOD, _DC, _field) \
|
|
if ((f->fp_flags & _DC) == 0) { \
|
|
if ((f->fp_flags & _MOD) == 0) { \
|
|
if (f->_field != find->_field) \
|
|
continue; \
|
|
} else { \
|
|
if (f->_field == 0 || find->_field % f->_field) \
|
|
continue; \
|
|
} \
|
|
}
|
|
|
|
SLIST_FOREACH(f, list, fp_next) {
|
|
if (f->fp_tcpopts != find->fp_tcpopts ||
|
|
f->fp_optcnt != find->fp_optcnt ||
|
|
f->fp_ttl < find->fp_ttl ||
|
|
f->fp_ttl - find->fp_ttl > ttldiff ||
|
|
(f->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)) !=
|
|
(find->fp_flags & (PF_OSFP_DF|PF_OSFP_TS0)))
|
|
continue;
|
|
|
|
MATCH_INT(PF_OSFP_PSIZE_MOD, PF_OSFP_PSIZE_DC, fp_psize)
|
|
MATCH_INT(PF_OSFP_MSS_MOD, PF_OSFP_MSS_DC, fp_mss)
|
|
MATCH_INT(PF_OSFP_WSCALE_MOD, PF_OSFP_WSCALE_DC, fp_wscale)
|
|
if ((f->fp_flags & PF_OSFP_WSIZE_DC) == 0) {
|
|
if (f->fp_flags & PF_OSFP_WSIZE_MSS) {
|
|
if (find->fp_mss == 0)
|
|
continue;
|
|
|
|
/* Some "smart" NAT devices and DSL routers will tweak the MSS size and
|
|
* will set it to whatever is suitable for the link type.
|
|
*/
|
|
#define SMART_MSS 1460
|
|
if ((find->fp_wsize % find->fp_mss ||
|
|
find->fp_wsize / find->fp_mss !=
|
|
f->fp_wsize) &&
|
|
(find->fp_wsize % SMART_MSS ||
|
|
find->fp_wsize / SMART_MSS !=
|
|
f->fp_wsize))
|
|
continue;
|
|
} else if (f->fp_flags & PF_OSFP_WSIZE_MTU) {
|
|
if (find->fp_mss == 0)
|
|
continue;
|
|
|
|
#define MTUOFF (sizeof(struct ip) + sizeof(struct tcphdr))
|
|
#define SMART_MTU (SMART_MSS + MTUOFF)
|
|
if ((find->fp_wsize % (find->fp_mss + MTUOFF) ||
|
|
find->fp_wsize / (find->fp_mss + MTUOFF) !=
|
|
f->fp_wsize) &&
|
|
(find->fp_wsize % SMART_MTU ||
|
|
find->fp_wsize / SMART_MTU !=
|
|
f->fp_wsize))
|
|
continue;
|
|
} else if (f->fp_flags & PF_OSFP_WSIZE_MOD) {
|
|
if (f->fp_wsize == 0 || find->fp_wsize %
|
|
f->fp_wsize)
|
|
continue;
|
|
} else {
|
|
if (f->fp_wsize != find->fp_wsize)
|
|
continue;
|
|
}
|
|
}
|
|
return (f);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/* Find an exact fingerprint in the list */
|
|
struct pf_os_fingerprint *
|
|
pf_osfp_find_exact(struct pf_osfp_list *list, struct pf_os_fingerprint *find)
|
|
{
|
|
struct pf_os_fingerprint *f;
|
|
|
|
SLIST_FOREACH(f, list, fp_next) {
|
|
if (f->fp_tcpopts == find->fp_tcpopts &&
|
|
f->fp_wsize == find->fp_wsize &&
|
|
f->fp_psize == find->fp_psize &&
|
|
f->fp_mss == find->fp_mss &&
|
|
f->fp_flags == find->fp_flags &&
|
|
f->fp_optcnt == find->fp_optcnt &&
|
|
f->fp_wscale == find->fp_wscale &&
|
|
f->fp_ttl == find->fp_ttl)
|
|
return (f);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/* Insert a fingerprint into the list */
|
|
void
|
|
pf_osfp_insert(struct pf_osfp_list *list, struct pf_os_fingerprint *ins)
|
|
{
|
|
struct pf_os_fingerprint *f, *prev = NULL;
|
|
|
|
/* XXX need to go semi tree based. can key on tcp options */
|
|
|
|
SLIST_FOREACH(f, list, fp_next)
|
|
prev = f;
|
|
if (prev)
|
|
SLIST_INSERT_AFTER(prev, ins, fp_next);
|
|
else
|
|
SLIST_INSERT_HEAD(list, ins, fp_next);
|
|
}
|
|
|
|
/* Fill a fingerprint by its number (from an ioctl) */
|
|
int
|
|
pf_osfp_get(struct pf_osfp_ioctl *fpioc)
|
|
{
|
|
struct pf_os_fingerprint *fp;
|
|
struct pf_osfp_entry *entry;
|
|
int num = fpioc->fp_getnum;
|
|
int i = 0;
|
|
|
|
|
|
memset(fpioc, 0, sizeof(*fpioc));
|
|
SLIST_FOREACH(fp, &pf_osfp_list, fp_next) {
|
|
SLIST_FOREACH(entry, &fp->fp_oses, fp_entry) {
|
|
if (i++ == num) {
|
|
fpioc->fp_mss = fp->fp_mss;
|
|
fpioc->fp_wsize = fp->fp_wsize;
|
|
fpioc->fp_flags = fp->fp_flags;
|
|
fpioc->fp_psize = fp->fp_psize;
|
|
fpioc->fp_ttl = fp->fp_ttl;
|
|
fpioc->fp_wscale = fp->fp_wscale;
|
|
fpioc->fp_getnum = num;
|
|
memcpy(&fpioc->fp_os, entry,
|
|
sizeof(fpioc->fp_os));
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
|
|
return (EBUSY);
|
|
}
|
|
|
|
|
|
/* Validate that each signature is reachable */
|
|
struct pf_os_fingerprint *
|
|
pf_osfp_validate(void)
|
|
{
|
|
struct pf_os_fingerprint *f, *f2, find;
|
|
|
|
SLIST_FOREACH(f, &pf_osfp_list, fp_next) {
|
|
memcpy(&find, f, sizeof(find));
|
|
|
|
/* We do a few MSS/th_win percolations to make things unique */
|
|
if (find.fp_mss == 0)
|
|
find.fp_mss = 128;
|
|
if (f->fp_flags & PF_OSFP_WSIZE_MSS)
|
|
find.fp_wsize *= find.fp_mss, 1;
|
|
else if (f->fp_flags & PF_OSFP_WSIZE_MTU)
|
|
find.fp_wsize *= (find.fp_mss + 40);
|
|
else if (f->fp_flags & PF_OSFP_WSIZE_MOD)
|
|
find.fp_wsize *= 2;
|
|
if (f != (f2 = pf_osfp_find(&pf_osfp_list, &find, 0))) {
|
|
if (f2)
|
|
printf("Found \"%s %s %s\" instead of "
|
|
"\"%s %s %s\"\n",
|
|
SLIST_FIRST(&f2->fp_oses)->fp_class_nm,
|
|
SLIST_FIRST(&f2->fp_oses)->fp_version_nm,
|
|
SLIST_FIRST(&f2->fp_oses)->fp_subtype_nm,
|
|
SLIST_FIRST(&f->fp_oses)->fp_class_nm,
|
|
SLIST_FIRST(&f->fp_oses)->fp_version_nm,
|
|
SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
|
|
else
|
|
printf("Couldn't find \"%s %s %s\"\n",
|
|
SLIST_FIRST(&f->fp_oses)->fp_class_nm,
|
|
SLIST_FIRST(&f->fp_oses)->fp_version_nm,
|
|
SLIST_FIRST(&f->fp_oses)->fp_subtype_nm);
|
|
return (f);
|
|
}
|
|
}
|
|
return (NULL);
|
|
}
|