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/*
* 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 <stdio.h>
#include <ftypes-int.h>
#include <string.h>
#include <strutil.h>
#include <wsutil/ws_assert.h>
static void
string_fvalue_new(fvalue_t *fv)
{
fv->value.strbuf = NULL;
}
static void
string_fvalue_copy(fvalue_t *dst, const fvalue_t *src)
{
dst->value.strbuf = wmem_strbuf_dup(NULL, src->value.strbuf);
}
static void
string_fvalue_free(fvalue_t *fv)
{
wmem_strbuf_destroy(fv->value.strbuf);
}
static void
string_fvalue_set_strbuf(fvalue_t *fv, wmem_strbuf_t *value)
{
DISSECTOR_ASSERT(value != NULL);
/* Free up the old value, if we have one */
string_fvalue_free(fv);
fv->value.strbuf = value;
}
static char *
string_to_repr(wmem_allocator_t *scope, const fvalue_t *fv, ftrepr_t rtype _U_, int field_display _U_)
{
if (rtype == FTREPR_DISPLAY) {
return ws_escape_null(scope, fv->value.strbuf->str, fv->value.strbuf->len, false);
}
if (rtype == FTREPR_DFILTER) {
return ws_escape_string_len(scope, fv->value.strbuf->str, fv->value.strbuf->len, true);
}
ws_assert_not_reached();
}
static const wmem_strbuf_t *
value_get(fvalue_t *fv)
{
return fv->value.strbuf;
}
static gboolean
val_from_string(fvalue_t *fv, const char *s, size_t len, gchar **err_msg _U_)
{
/* Free up the old value, if we have one */
string_fvalue_free(fv);
if (len > 0)
fv->value.strbuf = wmem_strbuf_new_len(NULL, s, len);
else
fv->value.strbuf = wmem_strbuf_new(NULL, s);
return TRUE;
}
static gboolean
val_from_literal(fvalue_t *fv, const char *s, gboolean allow_partial_value _U_, gchar **err_msg _U_)
{
/* Just turn it into a string */
/* XXX Should probably be a syntax error instead. It's more user-friendly to ask the
* user to be explicit about the meaning of an unquoted literal than them trying to figure out
* why a valid filter expression is giving wrong results. */
string_fvalue_free(fv);
fv->value.strbuf = wmem_strbuf_new(NULL, s);
return TRUE;
}
static gboolean
val_from_charconst(fvalue_t *fv, unsigned long num, gchar **err_msg)
{
/* XXX Should be a syntax error if literal is also a syntax error. */
/* Free up the old value, if we have one */
string_fvalue_free(fv);
fv->value.strbuf = NULL;
if (num > UINT8_MAX) {
if (err_msg) {
*err_msg = ws_strdup_printf("%lu is too large for a byte value", num);
}
return FALSE;
}
char c = (char)num;
fv->value.strbuf = wmem_strbuf_new(NULL, NULL);
wmem_strbuf_append_c(fv->value.strbuf, c);
return TRUE;
}
static gboolean
string_is_zero(const fvalue_t *fv)
{
return fv->value.strbuf == NULL || fv->value.strbuf->len == 0;
}
static guint
len(fvalue_t *fv)
{
return (guint)fv->value.strbuf->len;
}
static void
slice(fvalue_t *fv, GByteArray *bytes, guint offset, guint length)
{
guint8* data;
data = (guint8*)fv->value.strbuf->str + offset;
g_byte_array_append(bytes, data, length);
}
static enum ft_result
cmp_order(const fvalue_t *a, const fvalue_t *b, int *cmp)
{
*cmp = wmem_strbuf_strcmp(a->value.strbuf, b->value.strbuf);
return FT_OK;
}
static enum ft_result
cmp_contains(const fvalue_t *fv_a, const fvalue_t *fv_b, gboolean *contains)
{
/* According to
* http://www.introl.com/introl-demo/Libraries/C/ANSI_C/string/strstr.html
* strstr() returns a non-NULL value if needle is an empty
* string. We don't that behavior for cmp_contains. */
if (fv_b->value.strbuf->len == 0) {
*contains = FALSE;
return FT_OK;
}
if (wmem_strbuf_strstr(fv_a->value.strbuf, fv_b->value.strbuf)) {
*contains = TRUE;
}
else {
*contains = FALSE;
}
return FT_OK;
}
static enum ft_result
cmp_matches(const fvalue_t *fv, const ws_regex_t *regex, gboolean *matches)
{
wmem_strbuf_t *buf = fv->value.strbuf;
if (regex == NULL) {
return FT_BADARG;
}
*matches = ws_regex_matches_length(regex, buf->str, buf->len);
return FT_OK;
}
void
ftype_register_string(void)
{
static ftype_t string_type = {
FT_STRING, /* ftype */
"FT_STRING", /* name */
"Character string", /* pretty_name */
0, /* wire_size */
string_fvalue_new, /* new_value */
string_fvalue_copy, /* copy_value */
string_fvalue_free, /* free_value */
val_from_literal, /* val_from_literal */
val_from_string, /* val_from_string */
val_from_charconst, /* val_from_charconst */
string_to_repr, /* val_to_string_repr */
NULL, /* val_to_uinteger64 */
NULL, /* val_to_sinteger64 */
{ .set_value_strbuf = string_fvalue_set_strbuf }, /* union set_value */
{ .get_value_strbuf = value_get }, /* union get_value */
cmp_order,
cmp_contains,
cmp_matches,
string_is_zero, /* is_zero */
NULL, /* is_negative */
len,
slice,
NULL, /* bitwise_and */
NULL, /* unary_minus */
NULL, /* add */
NULL, /* subtract */
NULL, /* multiply */
NULL, /* divide */
NULL, /* modulo */
};
static ftype_t stringz_type = {
FT_STRINGZ, /* ftype */
"FT_STRINGZ", /* name */
"Character string", /* pretty name */
0, /* wire_size */
string_fvalue_new, /* new_value */
string_fvalue_copy, /* copy_value */
string_fvalue_free, /* free_value */
val_from_literal, /* val_from_literal */
val_from_string, /* val_from_string */
val_from_charconst, /* val_from_charconst */
string_to_repr, /* val_to_string_repr */
NULL, /* val_to_uinteger64 */
NULL, /* val_to_sinteger64 */
{ .set_value_strbuf = string_fvalue_set_strbuf }, /* union set_value */
{ .get_value_strbuf = value_get }, /* union get_value */
cmp_order,
cmp_contains, /* cmp_contains */
cmp_matches,
string_is_zero, /* is_zero */
NULL, /* is_negative */
len,
slice,
NULL, /* bitwise_and */
NULL, /* unary_minus */
NULL, /* add */
NULL, /* subtract */
NULL, /* multiply */
NULL, /* divide */
NULL, /* modulo */
};
static ftype_t uint_string_type = {
FT_UINT_STRING, /* ftype */
"FT_UINT_STRING", /* name */
"Character string", /* pretty_name */
0, /* wire_size */
string_fvalue_new, /* new_value */
string_fvalue_copy, /* copy_value */
string_fvalue_free, /* free_value */
val_from_literal, /* val_from_literal */
val_from_string, /* val_from_string */
val_from_charconst, /* val_from_charconst */
string_to_repr, /* val_to_string_repr */
NULL, /* val_to_uinteger64 */
NULL, /* val_to_sinteger64 */
{ .set_value_strbuf = string_fvalue_set_strbuf }, /* union set_value */
{ .get_value_strbuf = value_get }, /* union get_value */
cmp_order,
cmp_contains, /* cmp_contains */
cmp_matches,
string_is_zero, /* is_zero */
NULL, /* is_negative */
len,
slice,
NULL, /* bitwise_and */
NULL, /* unary_minus */
NULL, /* add */
NULL, /* subtract */
NULL, /* multiply */
NULL, /* divide */
NULL, /* modulo */
};
static ftype_t stringzpad_type = {
FT_STRINGZPAD, /* ftype */
"FT_STRINGZPAD", /* name */
"Character string", /* pretty name */
0, /* wire_size */
string_fvalue_new, /* new_value */
string_fvalue_copy, /* copy_value */
string_fvalue_free, /* free_value */
val_from_literal, /* val_from_literal */
val_from_string, /* val_from_string */
val_from_charconst, /* val_from_charconst */
string_to_repr, /* val_to_string_repr */
NULL, /* val_to_uinteger64 */
NULL, /* val_to_sinteger64 */
{ .set_value_strbuf = string_fvalue_set_strbuf }, /* union set_value */
{ .get_value_strbuf = value_get }, /* union get_value */
cmp_order,
cmp_contains, /* cmp_contains */
cmp_matches,
string_is_zero, /* is_zero */
NULL, /* is_negative */
len,
slice,
NULL, /* bitwise_and */
NULL, /* unary_minus */
NULL, /* add */
NULL, /* subtract */
NULL, /* multiply */
NULL, /* divide */
NULL, /* modulo */
};
static ftype_t stringztrunc_type = {
FT_STRINGZTRUNC, /* ftype */
"FT_STRINGZTRUNC", /* name */
"Character string", /* pretty name */
0, /* wire_size */
string_fvalue_new, /* new_value */
string_fvalue_copy, /* copy_value */
string_fvalue_free, /* free_value */
val_from_literal, /* val_from_literal */
val_from_string, /* val_from_string */
val_from_charconst, /* val_from_charconst */
string_to_repr, /* val_to_string_repr */
NULL, /* val_to_uinteger64 */
NULL, /* val_to_sinteger64 */
{ .set_value_strbuf = string_fvalue_set_strbuf }, /* union set_value */
{ .get_value_strbuf = value_get }, /* union get_value */
cmp_order,
cmp_contains, /* cmp_contains */
cmp_matches,
string_is_zero, /* is_zero */
NULL, /* is_negative */
len,
slice,
NULL, /* bitwise_and */
NULL, /* unary_minus */
NULL, /* add */
NULL, /* subtract */
NULL, /* multiply */
NULL, /* divide */
NULL, /* modulo */
};
ftype_register(FT_STRING, &string_type);
ftype_register(FT_STRINGZ, &stringz_type);
ftype_register(FT_UINT_STRING, &uint_string_type);
ftype_register(FT_STRINGZPAD, &stringzpad_type);
ftype_register(FT_STRINGZTRUNC, &stringztrunc_type);
}
void
ftype_register_pseudofields_string(int proto)
{
static int hf_ft_string;
static int hf_ft_stringz;
static int hf_ft_uint_string;
static int hf_ft_stringzpad;
static int hf_ft_stringztrunc;
static hf_register_info hf_ftypes[] = {
{ &hf_ft_string,
{ "FT_STRING", "_ws.ftypes.string",
FT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_ft_stringz,
{ "FT_STRINGZ", "_ws.ftypes.stringz",
FT_STRINGZ, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_ft_uint_string,
{ "FT_UINT_STRING", "_ws.ftypes.uint_string",
FT_UINT_STRING, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_ft_stringzpad,
{ "FT_STRINGZPAD", "_ws.ftypes.stringzpad",
FT_STRINGZPAD, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
{ &hf_ft_stringztrunc,
{ "FT_STRINGZTRUNC", "_ws.ftypes.stringztrunc",
FT_STRINGZTRUNC, BASE_NONE, NULL, 0x00,
NULL, HFILL }
},
};
proto_register_field_array(proto, hf_ftypes, array_length(hf_ftypes));
}
/*
* Editor modelines - https://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:
*/
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