forked from osmocom/wireshark
![Dario Lombardo](/assets/img/avatar_default.png)
Skipping dissectors dir for now. Change-Id: I717b66bfbc7cc81b83f8c2cbc011fcad643796aa Reviewed-on: https://code.wireshark.org/review/25694 Petri-Dish: Dario Lombardo <lomato@gmail.com> Tested-by: Petri Dish Buildbot Reviewed-by: Anders Broman <a.broman58@gmail.com>
488 lines
11 KiB
C
488 lines
11 KiB
C
/*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 2001 Gerald Combs
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <ftypes-int.h>
|
|
#include <epan/to_str-int.h>
|
|
#include <string.h>
|
|
|
|
#include <epan/exceptions.h>
|
|
|
|
#define CMP_MATCHES cmp_matches
|
|
|
|
#define tvb_is_private fvalue_gboolean1
|
|
|
|
static void
|
|
value_new(fvalue_t *fv)
|
|
{
|
|
fv->value.protocol.tvb = NULL;
|
|
fv->value.protocol.proto_string = NULL;
|
|
fv->tvb_is_private = FALSE;
|
|
}
|
|
|
|
static void
|
|
value_free(fvalue_t *fv)
|
|
{
|
|
if (fv->value.protocol.tvb && fv->tvb_is_private) {
|
|
tvb_free_chain(fv->value.protocol.tvb);
|
|
}
|
|
g_free(fv->value.protocol.proto_string);
|
|
}
|
|
|
|
static void
|
|
value_set(fvalue_t *fv, tvbuff_t *value, const gchar *name)
|
|
{
|
|
/* Free up the old value, if we have one */
|
|
value_free(fv);
|
|
|
|
fv->value.protocol.tvb = value;
|
|
fv->value.protocol.proto_string = g_strdup(name);
|
|
}
|
|
|
|
static void
|
|
free_tvb_data(void *data)
|
|
{
|
|
g_free(data);
|
|
}
|
|
|
|
static gboolean
|
|
val_from_string(fvalue_t *fv, const char *s, gchar **err_msg _U_)
|
|
{
|
|
tvbuff_t *new_tvb;
|
|
guint8 *private_data;
|
|
|
|
/* Free up the old value, if we have one */
|
|
value_free(fv);
|
|
|
|
/* Make a tvbuff from the string. We can drop the
|
|
* terminating NUL. */
|
|
private_data = (guint8 *)g_memdup(s, (guint)strlen(s));
|
|
new_tvb = tvb_new_real_data(private_data,
|
|
(guint)strlen(s), (gint)strlen(s));
|
|
|
|
/* Let the tvbuff know how to delete the data. */
|
|
tvb_set_free_cb(new_tvb, free_tvb_data);
|
|
|
|
/* And let us know that we need to free the tvbuff */
|
|
fv->tvb_is_private = TRUE;
|
|
fv->value.protocol.tvb = new_tvb;
|
|
fv->value.protocol.proto_string = g_strdup(s);
|
|
return TRUE;
|
|
}
|
|
|
|
static gboolean
|
|
val_from_unparsed(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, gchar **err_msg)
|
|
{
|
|
fvalue_t *fv_bytes;
|
|
tvbuff_t *new_tvb;
|
|
guint8 *private_data;
|
|
|
|
/* Free up the old value, if we have one */
|
|
value_free(fv);
|
|
|
|
/* Does this look like a byte string? */
|
|
fv_bytes = fvalue_from_unparsed(FT_BYTES, s, TRUE, NULL);
|
|
if (fv_bytes) {
|
|
/* Make a tvbuff from the bytes */
|
|
private_data = (guint8 *)g_memdup(fv_bytes->value.bytes->data,
|
|
fv_bytes->value.bytes->len);
|
|
new_tvb = tvb_new_real_data(private_data,
|
|
fv_bytes->value.bytes->len,
|
|
fv_bytes->value.bytes->len);
|
|
|
|
/* Let the tvbuff know how to delete the data. */
|
|
tvb_set_free_cb(new_tvb, free_tvb_data);
|
|
|
|
/* And let us know that we need to free the tvbuff */
|
|
fv->tvb_is_private = TRUE;
|
|
fv->value.protocol.tvb = new_tvb;
|
|
return TRUE;
|
|
}
|
|
|
|
/* Treat it as a string. */
|
|
return val_from_string(fv, s, err_msg);
|
|
}
|
|
|
|
static int
|
|
val_repr_len(fvalue_t *fv, ftrepr_t rtype, int field_display _U_)
|
|
{
|
|
volatile guint length = 0;
|
|
|
|
if (rtype != FTREPR_DFILTER) return -1;
|
|
|
|
TRY {
|
|
/* 3 bytes for each byte of the byte "NN:" minus 1 byte
|
|
* as there's no trailing ":". */
|
|
length = tvb_captured_length(fv->value.protocol.tvb) * 3 - 1;
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return (int) length;
|
|
}
|
|
|
|
static void
|
|
val_to_repr(fvalue_t *fv, ftrepr_t rtype, int field_display _U_, char * volatile buf, unsigned int size _U_)
|
|
{
|
|
guint length;
|
|
|
|
g_assert(rtype == FTREPR_DFILTER);
|
|
|
|
TRY {
|
|
length = tvb_captured_length(fv->value.protocol.tvb);
|
|
|
|
if (length)
|
|
buf = bytes_to_hexstr_punct(buf, tvb_get_ptr(fv->value.protocol.tvb, 0, length), length, ':');
|
|
*buf = '\0';
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
}
|
|
|
|
static gpointer
|
|
value_get(fvalue_t *fv)
|
|
{
|
|
return fv->value.protocol.tvb;
|
|
}
|
|
|
|
static guint
|
|
len(fvalue_t *fv)
|
|
{
|
|
volatile guint length = 0;
|
|
|
|
TRY {
|
|
if (fv->value.protocol.tvb)
|
|
length = tvb_captured_length(fv->value.protocol.tvb);
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return length;
|
|
}
|
|
|
|
static void
|
|
slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
|
|
{
|
|
const guint8* data;
|
|
|
|
if (fv->value.protocol.tvb) {
|
|
TRY {
|
|
data = tvb_get_ptr(fv->value.protocol.tvb, offset, length);
|
|
g_byte_array_append(bytes, data, length);
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
}
|
|
}
|
|
|
|
static gboolean
|
|
cmp_eq(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
const protocol_value_t *b = (const protocol_value_t *)&fv_b->value.protocol;
|
|
volatile gboolean eq = FALSE;
|
|
|
|
TRY {
|
|
if ((a->tvb != NULL) && (b->tvb != NULL)) {
|
|
guint a_len = tvb_captured_length(a->tvb);
|
|
|
|
if (a_len == tvb_captured_length(b->tvb))
|
|
eq = (memcmp(tvb_get_ptr(a->tvb, 0, a_len), tvb_get_ptr(b->tvb, 0, a_len), a_len) == 0);
|
|
} else {
|
|
eq = (strcmp(a->proto_string, b->proto_string) == 0);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return eq;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_ne(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
const protocol_value_t *b = (const protocol_value_t *)&fv_b->value.protocol;
|
|
volatile gboolean ne = TRUE;
|
|
|
|
TRY {
|
|
if ((a->tvb != NULL) && (b->tvb != NULL)) {
|
|
guint a_len = tvb_captured_length(a->tvb);
|
|
|
|
if (a_len == tvb_captured_length(b->tvb))
|
|
ne = (memcmp(tvb_get_ptr(a->tvb, 0, a_len), tvb_get_ptr(b->tvb, 0, a_len), a_len) != 0);
|
|
} else {
|
|
ne = (strcmp(a->proto_string, b->proto_string) != 0);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return ne;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_gt(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
const protocol_value_t *b = (const protocol_value_t *)&fv_b->value.protocol;
|
|
volatile gboolean gt = FALSE;
|
|
|
|
TRY {
|
|
if ((a->tvb != NULL) && (b->tvb != NULL)) {
|
|
guint a_len = tvb_captured_length(a->tvb);
|
|
guint b_len = tvb_captured_length(b->tvb);
|
|
|
|
if (a_len > b_len) {
|
|
gt = TRUE;
|
|
} else if (a_len == b_len) {
|
|
gt = (memcmp(tvb_get_ptr(a->tvb, 0, a_len), tvb_get_ptr(b->tvb, 0, a_len), a_len) > 0);
|
|
}
|
|
} else {
|
|
return (strcmp(a->proto_string, b->proto_string) > 0);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return gt;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_ge(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
const protocol_value_t *b = (const protocol_value_t *)&fv_b->value.protocol;
|
|
volatile gboolean ge = FALSE;
|
|
|
|
TRY {
|
|
if ((a->tvb != NULL) && (b->tvb != NULL)) {
|
|
guint a_len = tvb_captured_length(a->tvb);
|
|
guint b_len = tvb_captured_length(b->tvb);
|
|
|
|
if (a_len > b_len) {
|
|
ge = TRUE;
|
|
} else if (a_len == b_len) {
|
|
ge = (memcmp(tvb_get_ptr(a->tvb, 0, a_len), tvb_get_ptr(b->tvb, 0, a_len), a_len) >= 0);
|
|
}
|
|
} else {
|
|
return (strcmp(a->proto_string, b->proto_string) >= 0);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return ge;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_lt(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
const protocol_value_t *b = (const protocol_value_t *)&fv_b->value.protocol;
|
|
volatile gboolean lt = FALSE;
|
|
|
|
TRY {
|
|
if ((a->tvb != NULL) && (b->tvb != NULL)) {
|
|
guint a_len = tvb_captured_length(a->tvb);
|
|
guint b_len = tvb_captured_length(b->tvb);
|
|
|
|
if (a_len < b_len) {
|
|
lt = TRUE;
|
|
} else if (a_len == b_len) {
|
|
lt = (memcmp(tvb_get_ptr(a->tvb, 0, a_len), tvb_get_ptr(b->tvb, 0, a_len), a_len) < 0);
|
|
}
|
|
} else {
|
|
return (strcmp(a->proto_string, b->proto_string) < 0);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return lt;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_le(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
const protocol_value_t *b = (const protocol_value_t *)&fv_b->value.protocol;
|
|
volatile gboolean le = FALSE;
|
|
|
|
TRY {
|
|
if ((a->tvb != NULL) && (b->tvb != NULL)) {
|
|
guint a_len = tvb_captured_length(a->tvb);
|
|
guint b_len = tvb_captured_length(b->tvb);
|
|
|
|
if (a_len < b_len) {
|
|
le = TRUE;
|
|
} else if (a_len == b_len) {
|
|
le = (memcmp(tvb_get_ptr(a->tvb, 0, a_len), tvb_get_ptr(b->tvb, 0, a_len), a_len) <= 0);
|
|
}
|
|
} else {
|
|
return (strcmp(a->proto_string, b->proto_string) <= 0);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return le;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_contains(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
volatile gboolean contains = FALSE;
|
|
|
|
TRY {
|
|
/* First see if tvb exists for both sides */
|
|
if ((fv_a->value.protocol.tvb != NULL) && (fv_b->value.protocol.tvb != NULL)) {
|
|
if (tvb_find_tvb(fv_a->value.protocol.tvb, fv_b->value.protocol.tvb, 0) > -1) {
|
|
contains = TRUE;
|
|
}
|
|
} else {
|
|
/* Otherwise just compare strings */
|
|
if ((strlen(fv_b->value.protocol.proto_string) != 0) &&
|
|
strstr(fv_a->value.protocol.proto_string, fv_b->value.protocol.proto_string)) {
|
|
contains = TRUE;
|
|
}
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
/* nothing */
|
|
}
|
|
ENDTRY;
|
|
|
|
return contains;
|
|
}
|
|
|
|
static gboolean
|
|
cmp_matches(const fvalue_t *fv_a, const fvalue_t *fv_b)
|
|
{
|
|
const protocol_value_t *a = (const protocol_value_t *)&fv_a->value.protocol;
|
|
GRegex *regex = fv_b->value.re;
|
|
volatile gboolean rc = FALSE;
|
|
const char *data = NULL; /* tvb data */
|
|
guint32 tvb_len; /* tvb length */
|
|
|
|
/* 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 (! regex) {
|
|
return FALSE;
|
|
}
|
|
TRY {
|
|
if (a->tvb != NULL) {
|
|
tvb_len = tvb_captured_length(a->tvb);
|
|
data = (const char *)tvb_get_ptr(a->tvb, 0, tvb_len);
|
|
rc = g_regex_match_full(
|
|
regex, /* Compiled PCRE */
|
|
data, /* The data to check for the pattern... */
|
|
tvb_len, /* ... and its length */
|
|
0, /* Start offset within data */
|
|
(GRegexMatchFlags)0, /* GRegexMatchFlags */
|
|
NULL, /* We are not interested in the match information */
|
|
NULL /* We don't want error information */
|
|
);
|
|
/* NOTE - DO NOT g_free(data) */
|
|
} else {
|
|
rc = g_regex_match_full(
|
|
regex, /* Compiled PCRE */
|
|
a->proto_string, /* The data to check for the pattern... */
|
|
(int)strlen(a->proto_string), /* ... and its length */
|
|
0, /* Start offset within data */
|
|
(GRegexMatchFlags)0, /* GRegexMatchFlags */
|
|
NULL, /* We are not interested in the match information */
|
|
NULL /* We don't want error information */
|
|
);
|
|
}
|
|
}
|
|
CATCH_ALL {
|
|
return FALSE;
|
|
}
|
|
ENDTRY;
|
|
return rc;
|
|
}
|
|
|
|
void
|
|
ftype_register_tvbuff(void)
|
|
{
|
|
|
|
static ftype_t protocol_type = {
|
|
FT_PROTOCOL, /* ftype */
|
|
"FT_PROTOCOL", /* name */
|
|
"Protocol", /* pretty_name */
|
|
0, /* wire_size */
|
|
value_new, /* new_value */
|
|
value_free, /* free_value */
|
|
val_from_unparsed, /* val_from_unparsed */
|
|
val_from_string, /* val_from_string */
|
|
val_to_repr, /* val_to_string_repr */
|
|
val_repr_len, /* len_string_repr */
|
|
|
|
{ .set_value_protocol = value_set }, /* union set_value */
|
|
{ .get_value_ptr = value_get }, /* union get_value */
|
|
|
|
cmp_eq,
|
|
cmp_ne,
|
|
cmp_gt,
|
|
cmp_ge,
|
|
cmp_lt,
|
|
cmp_le,
|
|
NULL, /* cmp_bitwise_and */
|
|
cmp_contains,
|
|
CMP_MATCHES,
|
|
|
|
len,
|
|
slice,
|
|
|
|
};
|
|
|
|
|
|
ftype_register(FT_PROTOCOL, &protocol_type);
|
|
}
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|