346 lines
8.7 KiB
C
346 lines
8.7 KiB
C
/*
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* Wireshark - Network traffic analyzer
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*
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* Copyright 2006 Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include <glib.h>
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#include "dfilter-int.h"
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#include "dfunctions.h"
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#include <string.h>
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#include <ftypes/ftypes-int.h>
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#include <ftypes/ftypes.h>
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#include <epan/exceptions.h>
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/* Convert an FT_STRING using a callback function */
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static gboolean
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string_walk(GList* arg1list, GList **retval, gchar(*conv_func)(gchar))
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{
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GList *arg1;
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fvalue_t *arg_fvalue;
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fvalue_t *new_ft_string;
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char *s, *c;
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arg1 = arg1list;
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while (arg1) {
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arg_fvalue = (fvalue_t *)arg1->data;
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/* XXX - it would be nice to handle FT_TVBUFF, too */
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if (IS_FT_STRING(fvalue_type_ftenum(arg_fvalue))) {
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s = (char *)wmem_strdup(NULL, (gchar *)fvalue_get(arg_fvalue));
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for (c = s; *c; c++) {
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*c = conv_func(*c);
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}
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new_ft_string = fvalue_new(FT_STRING);
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fvalue_set_string(new_ft_string, s);
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wmem_free(NULL, s);
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*retval = g_list_append(*retval, new_ft_string);
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}
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arg1 = arg1->next;
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}
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return TRUE;
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}
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/* dfilter function: lower() */
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static gboolean
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df_func_lower(GList* arg1list, GList *arg2junk _U_, GList **retval)
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{
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return string_walk(arg1list, retval, g_ascii_tolower);
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}
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/* dfilter function: upper() */
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static gboolean
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df_func_upper(GList* arg1list, GList *arg2junk _U_, GList **retval)
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{
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return string_walk(arg1list, retval, g_ascii_toupper);
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}
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/* dfilter function: len() */
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static gboolean
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df_func_len(GList* arg1list, GList *arg2junk _U_, GList **retval)
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{
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GList *arg1;
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fvalue_t *arg_fvalue;
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fvalue_t *ft_len;
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arg1 = arg1list;
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while (arg1) {
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arg_fvalue = (fvalue_t *)arg1->data;
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ft_len = fvalue_new(FT_UINT32);
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fvalue_set_uinteger(ft_len, fvalue_length(arg_fvalue));
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*retval = g_list_append(*retval, ft_len);
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arg1 = arg1->next;
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}
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return TRUE;
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}
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/* dfilter function: count() */
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static gboolean
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df_func_count(GList* arg1list, GList *arg2junk _U_, GList **retval)
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{
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fvalue_t *ft_ret;
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guint32 num_items;
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num_items = (guint32)g_list_length(arg1list);
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ft_ret = fvalue_new(FT_UINT32);
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fvalue_set_uinteger(ft_ret, num_items);
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*retval = g_list_append(*retval, ft_ret);
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return TRUE;
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}
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/* dfilter function: string() */
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static gboolean
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df_func_string(GList* arg1list, GList *arg2junk _U_, GList **retval)
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{
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GList *arg1 = arg1list;
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fvalue_t *arg_fvalue;
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fvalue_t *new_ft_string;
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char *s;
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while (arg1) {
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arg_fvalue = (fvalue_t *)arg1->data;
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switch (fvalue_type_ftenum(arg_fvalue))
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{
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case FT_UINT8:
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case FT_UINT16:
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case FT_UINT24:
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case FT_UINT32:
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case FT_UINT40:
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case FT_UINT48:
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case FT_UINT56:
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case FT_UINT64:
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case FT_INT8:
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case FT_INT16:
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case FT_INT32:
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case FT_INT40:
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case FT_INT48:
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case FT_INT56:
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case FT_INT64:
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case FT_IPv4:
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case FT_IPv6:
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case FT_FLOAT:
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case FT_DOUBLE:
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case FT_ETHER:
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case FT_FRAMENUM:
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case FT_AX25:
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case FT_IPXNET:
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case FT_GUID:
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case FT_OID:
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case FT_EUI64:
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case FT_VINES:
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case FT_REL_OID:
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case FT_SYSTEM_ID:
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case FT_FCWWN:
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case FT_IEEE_11073_SFLOAT:
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case FT_IEEE_11073_FLOAT:
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s = fvalue_to_string_repr(NULL, arg_fvalue, FTREPR_DFILTER, BASE_NONE);
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/* Ensure we have an allocated string here */
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if (!s)
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s = wmem_strdup(NULL, "");
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break;
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default:
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return TRUE;
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}
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new_ft_string = fvalue_new(FT_STRING);
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fvalue_set_string(new_ft_string, s);
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wmem_free(NULL, s);
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*retval = g_list_append(*retval, new_ft_string);
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arg1 = arg1->next;
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}
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return TRUE;
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}
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/* For upper() and lower() checks that the parameter passed to
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* it is an FT_STRING */
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static void
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ul_semcheck_params(dfwork_t *dfw, int param_num, stnode_t *st_node)
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{
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sttype_id_t type;
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ftenum_t ftype;
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header_field_info *hfinfo;
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type = stnode_type_id(st_node);
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if (param_num == 0) {
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switch(type) {
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case STTYPE_FIELD:
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hfinfo = (header_field_info *)stnode_data(st_node);
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ftype = hfinfo->type;
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if (!IS_FT_STRING(ftype)) {
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dfilter_fail(dfw, "Only strings can be used in upper() or lower() or len()");
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THROW(TypeError);
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}
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break;
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default:
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dfilter_fail(dfw, "Only string-type fields can be used in upper() or lower() or len()");
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THROW(TypeError);
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}
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}
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else {
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g_assert_not_reached();
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}
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}
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/* For len() checks that the parameter passed is valid */
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static void
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ul_semcheck_len_params(dfwork_t *dfw, int param_num, stnode_t *st_node)
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{
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sttype_id_t type;
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type = stnode_type_id(st_node);
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if (param_num == 0) {
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switch(type) {
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case STTYPE_FIELD:
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break;
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default:
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dfilter_fail(dfw, "invalid type in function len()");
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THROW(TypeError);
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}
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}
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else {
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g_assert_not_reached();
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}
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}
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static void
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ul_semcheck_field_param(dfwork_t *dfw, int param_num, stnode_t *st_node)
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{
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sttype_id_t type;
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type = stnode_type_id(st_node);
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if (param_num == 0) {
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switch(type) {
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case STTYPE_FIELD:
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break;
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default:
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dfilter_fail(dfw, "Only type fields can be used as parameter for count()");
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THROW(TypeError);
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}
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}
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else {
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g_assert_not_reached();
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}
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}
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static void
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ul_semcheck_string_param(dfwork_t *dfw, int param_num, stnode_t *st_node)
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{
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sttype_id_t type;
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ftenum_t ftype;
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header_field_info *hfinfo;
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const char* msg = "To string conversion for this field is not supported";
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type = stnode_type_id(st_node);
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if (param_num == 0) {
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switch(type) {
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case STTYPE_FIELD:
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hfinfo = (header_field_info *)stnode_data(st_node);
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ftype = hfinfo->type;
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switch (ftype)
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{
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case FT_UINT8:
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case FT_UINT16:
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case FT_UINT24:
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case FT_UINT32:
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case FT_UINT40:
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case FT_UINT48:
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case FT_UINT56:
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case FT_UINT64:
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case FT_INT8:
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case FT_INT16:
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case FT_INT32:
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case FT_INT40:
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case FT_INT48:
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case FT_INT56:
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case FT_INT64:
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case FT_IPv4:
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case FT_IPv6:
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case FT_FLOAT:
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case FT_DOUBLE:
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case FT_ETHER:
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case FT_FRAMENUM:
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case FT_AX25:
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case FT_IPXNET:
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case FT_GUID:
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case FT_OID:
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case FT_EUI64:
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case FT_VINES:
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case FT_REL_OID:
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case FT_SYSTEM_ID:
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case FT_FCWWN:
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case FT_IEEE_11073_SFLOAT:
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case FT_IEEE_11073_FLOAT:
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break;
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default:
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dfilter_fail(dfw, "%s", msg);
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THROW(TypeError);
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break;
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}
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break;
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default:
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dfilter_fail(dfw, "%s", msg);
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THROW(TypeError);
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}
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}
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else {
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g_assert_not_reached();
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}
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}
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/* The table of all display-filter functions */
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static df_func_def_t
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df_functions[] = {
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{ "lower", df_func_lower, FT_STRING, 1, 1, ul_semcheck_params },
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{ "upper", df_func_upper, FT_STRING, 1, 1, ul_semcheck_params },
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{ "len", df_func_len, FT_UINT32, 1, 1, ul_semcheck_len_params },
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{ "count", df_func_count, FT_UINT32, 1, 1, ul_semcheck_field_param },
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{ "string", df_func_string, FT_STRING, 1, 1, ul_semcheck_string_param },
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{ NULL, NULL, FT_NONE, 0, 0, NULL }
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};
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/* Lookup a display filter function record by name */
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df_func_def_t*
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df_func_lookup(char *name)
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{
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df_func_def_t *func_def;
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func_def = df_functions;
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while (func_def->function != NULL) {
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if (strcmp(func_def->name, name) == 0) {
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return func_def;
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}
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func_def++;
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}
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return NULL;
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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