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/*
* $Id$
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 2001 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <ftypes-int.h>
#include <string.h>
#include <ctype.h>
#include <epan/addr_resolv.h>
#include <epan/strutil.h>
#ifdef HAVE_LIBPCRE
#include <pcre.h>
#define CMP_MATCHES cmp_matches
#else
#define CMP_MATCHES NULL
#endif
#define ETHER_LEN 6
#define IPv6_LEN 16
static void
bytes_fvalue_new(fvalue_t *fv)
{
fv->value.bytes = NULL;
}
void
bytes_fvalue_free(fvalue_t *fv)
{
if (fv->value.bytes) {
g_byte_array_free(fv->value.bytes, TRUE);
fv->value.bytes=NULL;
}
}
static void
bytes_fvalue_set(fvalue_t *fv, gpointer value, gboolean already_copied)
{
g_assert(already_copied);
/* Free up the old value, if we have one */
bytes_fvalue_free(fv);
fv->value.bytes = value;
}
static int
bytes_repr_len(fvalue_t *fv, ftrepr_t rtype _U_)
{
/* 3 bytes for each byte of the byte "NN:" minus 1 byte
* as there's no trailing ":". */
return fv->value.bytes->len * 3 - 1;
}
static void
bytes_to_repr(fvalue_t *fv, ftrepr_t rtype _U_, char *buf)
{
guint8 *c;
char *write_cursor;
unsigned int i;
c = fv->value.bytes->data;
write_cursor = buf;
for (i = 0; i < fv->value.bytes->len; i++) {
if (i == 0) {
sprintf(write_cursor, "%02x", *c++);
write_cursor += 2;
}
else {
sprintf(write_cursor, ":%02x", *c++);
write_cursor += 3;
}
}
}
static void
common_fvalue_set(fvalue_t *fv, guint8* data, guint len)
{
/* Free up the old value, if we have one */
bytes_fvalue_free(fv);
fv->value.bytes = g_byte_array_new();
g_byte_array_append(fv->value.bytes, data, len);
}
static void
ether_fvalue_set(fvalue_t *fv, gpointer value, gboolean already_copied)
{
g_assert(!already_copied);
common_fvalue_set(fv, value, ETHER_LEN);
}
static void
ipv6_fvalue_set(fvalue_t *fv, gpointer value, gboolean already_copied)
{
g_assert(!already_copied);
common_fvalue_set(fv, value, IPv6_LEN);
}
static gpointer
value_get(fvalue_t *fv)
{
return fv->value.bytes->data;
}
static gboolean
bytes_from_string(fvalue_t *fv, char *s, LogFunc logfunc _U_)
{
GByteArray *bytes;
bytes = g_byte_array_new();
g_byte_array_append(bytes, (guint8 *)s, strlen(s));
/* Free up the old value, if we have one */
bytes_fvalue_free(fv);
fv->value.bytes = bytes;
return TRUE;
}
static gboolean
bytes_from_unparsed(fvalue_t *fv, char *s, gboolean allow_partial_value _U_, LogFunc logfunc)
{
GByteArray *bytes;
gboolean res;
bytes = g_byte_array_new();
res = hex_str_to_bytes(s, bytes, TRUE);
if (!res) {
if (logfunc != NULL)
logfunc("\"%s\" is not a valid byte string.", s);
g_byte_array_free(bytes, TRUE);
return FALSE;
}
/* Free up the old value, if we have one */
bytes_fvalue_free(fv);
fv->value.bytes = bytes;
return TRUE;
}
static gboolean
ether_from_unparsed(fvalue_t *fv, char *s, gboolean allow_partial_value, LogFunc logfunc)
{
guint8 *mac;
/*
* Don't log a message if this fails; we'll try looking it
* up as an Ethernet host name if it does, and if that fails,
* we'll log a message.
*/
if (bytes_from_unparsed(fv, s, TRUE, NULL)) {
if (fv->value.bytes->len > ETHER_LEN) {
logfunc("\"%s\" contains too many bytes to be a valid Ethernet address.",
s);
return FALSE;
}
else if (fv->value.bytes->len < ETHER_LEN && !allow_partial_value) {
logfunc("\"%s\" contains too few bytes to be a valid Ethernet address.",
s);
return FALSE;
}
return TRUE;
}
mac = get_ether_addr(s);
if (!mac) {
logfunc("\"%s\" is not a valid hostname or Ethernet address.",
s);
return FALSE;
}
ether_fvalue_set(fv, mac, FALSE);
return TRUE;
}
static gboolean
ipv6_from_unparsed(fvalue_t *fv, char *s, gboolean allow_partial_value _U_, LogFunc logfunc)
{
guint8 buffer[16];
if (!get_host_ipaddr6(s, (struct e_in6_addr*)buffer)) {
logfunc("\"%s\" is not a valid hostname or IPv6 address.", s);
return FALSE;
}
ipv6_fvalue_set(fv, buffer, FALSE);
return TRUE;
}
static guint
len(fvalue_t *fv)
{
return fv->value.bytes->len;
}
static void
slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
{
guint8* data;
data = fv->value.bytes->data + offset;
g_byte_array_append(bytes, data, length);
}
static gboolean
cmp_eq(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (a->len != b->len) {
return FALSE;
}
return (memcmp(a->data, b->data, a->len) == 0);
}
static gboolean
cmp_ne(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (a->len != b->len) {
return FALSE;
}
return (memcmp(a->data, b->data, a->len) != 0);
}
static gboolean
cmp_gt(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (a->len > b->len) {
return TRUE;
}
if (a->len < b->len) {
return FALSE;
}
return (memcmp(a->data, b->data, a->len) > 0);
}
static gboolean
cmp_ge(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (a->len > b->len) {
return TRUE;
}
if (a->len < b->len) {
return FALSE;
}
return (memcmp(a->data, b->data, a->len) >= 0);
}
static gboolean
cmp_lt(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (a->len < b->len) {
return TRUE;
}
if (a->len > b->len) {
return FALSE;
}
return (memcmp(a->data, b->data, a->len) < 0);
}
static gboolean
cmp_le(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (a->len < b->len) {
return TRUE;
}
if (a->len > b->len) {
return FALSE;
}
return (memcmp(a->data, b->data, a->len) <= 0);
}
static gboolean cmp_bytes_bitwise_and(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
guint i = 0;
unsigned char *p_a, *p_b;
if (b->len != a->len) {
return FALSE;
}
p_a = a->data;
p_b = b->data;
while (i < b->len) {
if (p_a[i] & p_b[i])
i++;
else
return FALSE;
}
return TRUE;
}
static gboolean
cmp_contains(fvalue_t *fv_a, fvalue_t *fv_b)
{
GByteArray *a = fv_a->value.bytes;
GByteArray *b = fv_b->value.bytes;
if (epan_memmem(a->data, a->len, b->data, b->len)) {
return TRUE;
}
else {
return FALSE;
}
}
#ifdef HAVE_LIBPCRE
static gboolean
cmp_matches(fvalue_t *fv_a, fvalue_t *fv_b)
{
GString *a = fv_a->value.gstring;
pcre_tuple_t *pcre = fv_b->value.re;
int options = 0;
int rc;
/* fv_b is always a FT_PCRE, otherwise the dfilter semcheck() would have
* warned us. For the same reason (and because we're using g_malloc()),
* fv_b->value.re is not NULL.
*/
if (strcmp(fv_b->ftype->name, "FT_PCRE") != 0) {
return FALSE;
}
if (! pcre) {
return FALSE;
}
rc = pcre_exec(
pcre->re, /* Compiled PCRE */
pcre->ex, /* PCRE extra from pcre_study() */
a->str, /* The data to check for the pattern... */
a->len, /* ... and its length */
0, /* Start offset within data */
options, /* PCRE options */
NULL, /* We are not interested in the matched string */
0 /* of the pattern; only in success or failure. */
);
/* NOTE - DO NOT g_free(data) */
if (rc == 0) {
return TRUE;
}
return FALSE;
}
#endif
void
ftype_register_bytes(void)
{
static ftype_t bytes_type = {
"FT_BYTES", /* name */
"sequence of bytes", /* pretty_name */
0, /* wire_size */
bytes_fvalue_new, /* new_value */
bytes_fvalue_free, /* free_value */
bytes_from_unparsed, /* val_from_unparsed */
bytes_from_string, /* val_from_string */
bytes_to_repr, /* val_to_string_repr */
bytes_repr_len, /* len_string_repr */
bytes_fvalue_set, /* set_value */
NULL, /* set_value_integer */
NULL, /* set_value_integer64 */
NULL, /* set_value_floating */
value_get, /* get_value */
NULL, /* get_value_integer */
NULL, /* get_value_integer64 */
NULL, /* get_value_floating */
cmp_eq,
cmp_ne,
cmp_gt,
cmp_ge,
cmp_lt,
cmp_le,
cmp_bytes_bitwise_and,
cmp_contains,
CMP_MATCHES,
len,
slice,
};
static ftype_t uint_bytes_type = {
"FT_UINT_BYTES", /* name */
"sequence of bytes", /* pretty_name */
0, /* wire_size */
bytes_fvalue_new, /* new_value */
bytes_fvalue_free, /* free_value */
bytes_from_unparsed, /* val_from_unparsed */
NULL, /* val_from_string */
bytes_to_repr, /* val_to_string_repr */
bytes_repr_len, /* len_string_repr */
bytes_fvalue_set, /* set_value */
NULL, /* set_value_integer */
NULL, /* set_value_integer64 */
NULL, /* set_value_floating */
value_get, /* get_value */
NULL, /* get_value_integer */
NULL, /* get_value_integer64 */
NULL, /* get_value_floating */
cmp_eq,
cmp_ne,
cmp_gt,
cmp_ge,
cmp_lt,
cmp_le,
cmp_bytes_bitwise_and,
cmp_contains,
NULL, /* cmp_matches */
len,
slice,
};
static ftype_t ether_type = {
"FT_ETHER", /* name */
"Ethernet or other MAC address",/* pretty_name */
ETHER_LEN, /* wire_size */
bytes_fvalue_new, /* new_value */
bytes_fvalue_free, /* free_value */
ether_from_unparsed, /* val_from_unparsed */
NULL, /* val_from_string */
bytes_to_repr, /* val_to_string_repr */
bytes_repr_len, /* len_string_repr */
ether_fvalue_set, /* set_value */
NULL, /* set_value_integer */
NULL, /* set_value_integer64 */
NULL, /* set_value_floating */
value_get, /* get_value */
NULL, /* get_value_integer */
NULL, /* get_value_integer64 */
NULL, /* get_value_floating */
cmp_eq,
cmp_ne,
cmp_gt,
cmp_ge,
cmp_lt,
cmp_le,
cmp_bytes_bitwise_and,
cmp_contains,
CMP_MATCHES,
len,
slice,
};
static ftype_t ipv6_type = {
"FT_IPv6", /* name */
"IPv6 address", /* pretty_name */
IPv6_LEN, /* wire_size */
bytes_fvalue_new, /* new_value */
bytes_fvalue_free, /* free_value */
ipv6_from_unparsed, /* val_from_unparsed */
NULL, /* val_from_string */
NULL, /* val_to_string_repr */
NULL, /* len_string_repr */
ipv6_fvalue_set, /* set_value */
NULL, /* set_value_integer */
NULL, /* set_value_integer64 */
NULL, /* set_value_floating */
value_get, /* get_value */
NULL, /* get_value_integer */
NULL, /* get_value_integer64 */
NULL, /* get_value_floating */
cmp_eq,
cmp_ne,
cmp_gt,
cmp_ge,
cmp_lt,
cmp_le,
cmp_bytes_bitwise_and,
cmp_contains,
NULL, /* cmp_matches */
len,
slice,
};
ftype_register(FT_BYTES, &bytes_type);
ftype_register(FT_UINT_BYTES, &uint_bytes_type);
ftype_register(FT_ETHER, ðer_type);
ftype_register(FT_IPv6, &ipv6_type);
}
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