forked from osmocom/wireshark
681 lines
16 KiB
C
681 lines
16 KiB
C
/* dfilter.c
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* Routines for display filters
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*
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* $Id: dfilter.c,v 1.6 1999/08/03 15:04:25 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifndef _STDIO_H
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#include <stdio.h>
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#endif
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#ifndef _STRING_H
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#include <string.h>
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#endif
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#ifndef __G_LIB_H__
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#include <glib.h>
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#endif
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#ifndef __PROTO_H__
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#include "proto.h"
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#endif
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#ifndef __DFILTER_H__
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#include "dfilter.h"
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#endif
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#include "dfilter-grammar.h"
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int yyparse(void); /* yacc entry-point */
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#define DFILTER_LEX_ABBREV_OFFSET 2000
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/* Balanced tree of abbreviations and IDs */
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GTree *dfilter_tokens = NULL;
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/* Comparision function for tree insertion. A wrapper around strcmp() */
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static int g_strcmp(gconstpointer a, gconstpointer b);
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/* Silly global variables used to pass parameter to check_relation_bytes() */
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int bytes_offset = 0;
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int bytes_length = 0;
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YYSTYPE yylval;
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/* in dfilter-grammar.y */
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extern GMemChunk *gmc_dfilter_nodes;
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extern GNode *dfilter_tree;
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extern GSList *dfilter_list_byte_arrays;
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/* in dfilter-scanner.l */
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void dfilter_scanner_text(char*);
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void dfilter_scanner_cleanup(void);
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static gboolean dfilter_apply_node(GNode *gnode, proto_tree *ptree, const guint8 *pd);
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static gboolean check_relation(gint operand, GNode *a, GNode *b, proto_tree *ptree, const guint8 *pd);
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static gboolean check_logical(gint operand, GNode *a, GNode *b, proto_tree *ptree, const guint8 *pd);
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static GArray* get_values_from_ptree(dfilter_node *dnode, proto_tree *ptree, const guint8 *pd);
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static GArray* get_values_from_dfilter(dfilter_node *dnode, GNode *gnode);
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static gboolean check_existence_in_ptree(dfilter_node *dnode, proto_tree *ptree);
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static void clear_byte_array(gpointer data, gpointer user_data);
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/* this is not so pretty. I need my own g_array "function" (macro) to
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* retreive the pointer to the data stored in an array cell. I need this
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* for type ether.. GArray makes it easy for me to store 6 bytes inside an array
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* cell, but hard to retrieve it.
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*/
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#define g_array_index_ptr(a,s,i) (((guint8*) (a)->data) + (i*s))
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void
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dfilter_init(void)
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{
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int i, num_symbols, symbol;
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char *s;
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dfilter_tokens = g_tree_new(g_strcmp);
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/* Add the header field and protocol abbrevs to the symbol table */
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num_symbols = proto_registrar_n();
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for (i=0; i < num_symbols; i++) {
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s = proto_registrar_get_abbrev(i);
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if (s) {
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symbol = DFILTER_LEX_ABBREV_OFFSET + i;
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g_tree_insert(dfilter_tokens, s, GINT_TO_POINTER(symbol));
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}
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}
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}
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/* I should eventually g_tree_destroy(dfilter_tokens), when ethereal shuts down */
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/* Compiles the textual representation of the display filter into a tree
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* of operations to perform.
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*/
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int
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dfilter_compile(char *dfilter_text, GNode **p_dfcode)
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{
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int retval;
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g_assert(dfilter_text != NULL);
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dfilter_scanner_text(dfilter_text);
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if (dfilter_tree) {
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/* clear tree */
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dfilter_tree = NULL;
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}
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/* clear the memory that the tree was using for nodes */
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g_mem_chunk_reset(gmc_dfilter_nodes);
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/* clear the memory that the tree was using for byte arrays */
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if (dfilter_list_byte_arrays) {
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g_slist_foreach(dfilter_list_byte_arrays, clear_byte_array, NULL);
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g_slist_free(dfilter_list_byte_arrays);
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dfilter_list_byte_arrays = NULL;
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}
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if (*p_dfcode != NULL)
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g_node_destroy(*p_dfcode);
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retval = yyparse();
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dfilter_scanner_cleanup();
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*p_dfcode = dfilter_tree;
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return retval;
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}
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static void
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clear_byte_array(gpointer data, gpointer user_data)
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{
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GByteArray *barray = data;
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g_byte_array_free(barray, TRUE);
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}
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void
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yyerror(char *s)
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{
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/* fprintf(stderr, "%s\n", s);
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Do not report the error, just let yyparse() return 1 */
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}
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void
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dfilter_yyerror(char *fmt, ...)
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{
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dfilter_tree = NULL;
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yyerror(fmt);
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}
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/* lookup an abbreviation in our token tree, returing the ID #
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* If the abbreviation doesn't exit, returns 0 */
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int dfilter_lookup_token(char *abbrev)
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{
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int value;
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g_assert(abbrev != NULL);
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value = GPOINTER_TO_INT(g_tree_lookup(dfilter_tokens, abbrev));
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if (value < DFILTER_LEX_ABBREV_OFFSET) {
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return 0;
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}
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return value - DFILTER_LEX_ABBREV_OFFSET;
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}
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static int
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g_strcmp(gconstpointer a, gconstpointer b)
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{
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return strcmp((const char*)a, (const char*)b);
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}
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gboolean
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dfilter_apply(GNode *dfcode, proto_tree *ptree, const guint8* pd)
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{
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gboolean retval;
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retval = dfilter_apply_node(dfcode, ptree, pd);
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return retval;
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}
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static gboolean
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dfilter_apply_node(GNode *gnode, proto_tree *ptree, const guint8* pd)
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{
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GNode *gnode_a, *gnode_b;
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dfilter_node *dnode = (dfilter_node*) (gnode->data);
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/* We'll get 2 NULLs if we don't have children */
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gnode_a = g_node_nth_child(gnode, 0);
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gnode_b = g_node_nth_child(gnode, 1);
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switch(dnode->ntype) {
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case variable:
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/* We'll never see this case because if the parser finds the name of
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* a variable, it will cause it to be an 'existence' operation.
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*/
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g_assert_not_reached();
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case logical:
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return check_logical(dnode->value.logical, gnode_a, gnode_b, ptree, pd);
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case relation:
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g_assert(gnode_a && gnode_b);
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return check_relation(dnode->value.relation, gnode_a, gnode_b, ptree, pd);
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case alternation:
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g_assert_not_reached();
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/* not coded yet */
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case numeric:
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case ipv4:
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case boolean:
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case ether:
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case string:
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case abs_time:
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case bytes:
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case ipxnet:
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/* the only time we'll see these at this point is if the display filter
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* is really wacky. (like simply "192.168.1.1"). The parser as it stands
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* now let these by. Just return TRUE */
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g_assert(!gnode_a && !gnode_b);
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return TRUE;
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case existence: /* checking the existence of a protocol or hf*/
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g_assert(!gnode_a && !gnode_b);
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return check_existence_in_ptree(dnode, ptree);
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}
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g_assert_not_reached();
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return FALSE;
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}
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static gboolean
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check_logical(gint operand, GNode *a, GNode *b, proto_tree *ptree, const guint8 *pd)
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{
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gboolean val_a = dfilter_apply_node(a, ptree, pd);
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gboolean val_b;
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switch(operand) {
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case TOK_AND:
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return (val_a && dfilter_apply_node(b, ptree, pd));
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case TOK_OR:
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return (val_a || dfilter_apply_node(b, ptree, pd));
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case TOK_XOR:
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val_b = dfilter_apply_node(b, ptree, pd);
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return ( ( val_a || val_b ) && ! ( val_a && val_b ) );
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case TOK_NOT:
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return (!val_a);
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default:
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g_assert_not_reached();
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}
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g_assert_not_reached();
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return FALSE;
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}
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/* this is inefficient. I get arrays for both a and b that represent all the values present. That is,
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* if a is bootp.option, e.g., i'll get an array showing all the bootp.option values in the protocol
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* tree. Then I'll get an array for b, which more than likely is a single int, and then I'll compare
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* them all. It makes my coding easier in the beginning, but I should change this to make it run
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* faster.
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*/
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static gboolean
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check_relation(gint operand, GNode *a, GNode *b, proto_tree *ptree, const guint8* pd)
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{
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dfilter_node *node_a = (dfilter_node*) (a->data);
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dfilter_node *node_b = (dfilter_node*) (b->data);
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GArray *vals_a, *vals_b;
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gboolean retval;
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bytes_length = MIN(node_a->length, node_b->length);
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bytes_offset = MIN(node_a->offset, node_b->offset);
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if (node_a->ntype == variable)
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vals_a = get_values_from_ptree(node_a, ptree, pd);
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else
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vals_a = get_values_from_dfilter(node_a, a);
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if (node_b->ntype == variable)
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vals_b = get_values_from_ptree(node_b, ptree, pd);
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else
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vals_b = get_values_from_dfilter(node_b, b);
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retval = node_a->check_relation_func(operand, vals_a, vals_b);
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g_array_free(vals_a, FALSE);
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g_array_free(vals_b, FALSE);
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return retval;
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}
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static gboolean
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check_existence_in_ptree(dfilter_node *dnode, proto_tree *ptree)
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{
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int target_field;
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proto_tree *subtree;
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target_field = dnode->value.variable;
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subtree = proto_find_field(ptree, target_field);
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if (subtree)
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return TRUE;
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else
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return FALSE;
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}
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static GArray*
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get_values_from_ptree(dfilter_node *dnode, proto_tree *ptree, const guint8 *pd)
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{
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GArray *array;
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int parent_protocol;
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int target_field;
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proto_tree *subtree = NULL; /* where the parent protocol's sub-tree starts */
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proto_tree_search_info sinfo;
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g_assert(dnode->elem_size > 0);
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array = g_array_new(FALSE, FALSE, dnode->elem_size);
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target_field = dnode->value.variable;
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/* Find the proto_tree subtree where we should start searching.*/
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if (proto_registrar_is_protocol(target_field)) {
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subtree = proto_find_protocol(ptree, target_field);
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}
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else {
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parent_protocol = proto_registrar_get_parent(target_field);
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if (parent_protocol >= 0) {
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subtree = proto_find_protocol(ptree, parent_protocol);
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}
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}
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if (subtree) {
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sinfo.target_field = target_field;
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sinfo.result_array = array;
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sinfo.packet_data = pd;
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proto_get_field_values(subtree, dnode->fill_array_func, &sinfo);
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}
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return array;
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}
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static GArray*
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get_values_from_dfilter(dfilter_node *dnode, GNode *gnode)
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{
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GArray *array;
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g_assert(dnode->elem_size > 0);
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array = g_array_new(FALSE, FALSE, dnode->elem_size);
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g_node_traverse(gnode, G_IN_ORDER, G_TRAVERSE_ALL, -1, dnode->fill_array_func, array);
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/* dnode->fill_array_func(gnode, array);*/
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return array;
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}
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gboolean fill_array_numeric_variable(GNode *gnode, gpointer data)
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{
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proto_tree_search_info *sinfo = (proto_tree_search_info*)data;
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field_info *fi = (field_info*) (gnode->data);
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if (fi->hfinfo->id == sinfo->target_field) {
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g_array_append_val(sinfo->result_array, fi->value.numeric);
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}
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_ether_variable(GNode *gnode, gpointer data)
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{
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proto_tree_search_info *sinfo = (proto_tree_search_info*)data;
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field_info *fi = (field_info*) (gnode->data);
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if (fi->hfinfo->id == sinfo->target_field) {
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g_array_append_val(sinfo->result_array, fi->value.ether);
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}
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_bytes_variable(GNode *gnode, gpointer data)
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{
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proto_tree_search_info *sinfo = (proto_tree_search_info*)data;
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field_info *fi = (field_info*) (gnode->data);
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GByteArray *barray;
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if (fi->hfinfo->id == sinfo->target_field) {
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barray = g_byte_array_new();
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/*dfilter_list_byte_arrays = g_slist_append(dfilter_list_byte_arrays, barray);*/
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g_byte_array_append(barray, sinfo->packet_data + fi->start + bytes_offset, bytes_length);
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g_array_append_val(sinfo->result_array, barray);
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}
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_boolean_variable(GNode *gnode, gpointer data)
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{
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proto_tree_search_info *sinfo = (proto_tree_search_info*)data;
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field_info *fi = (field_info*) (gnode->data);
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if (fi->hfinfo->id == sinfo->target_field) {
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g_array_append_val(sinfo->result_array, fi->value.boolean);
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}
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_numeric_value(GNode *gnode, gpointer data)
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{
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GArray *array = (GArray*)data;
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dfilter_node *dnode = (dfilter_node*) (gnode->data);
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g_array_append_val(array, dnode->value.numeric);
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_ether_value(GNode *gnode, gpointer data)
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{
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GArray *array = (GArray*)data;
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dfilter_node *dnode = (dfilter_node*) (gnode->data);
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g_array_append_val(array, dnode->value.ether);
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_bytes_value(GNode *gnode, gpointer data)
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{
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GArray *array = (GArray*)data;
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dfilter_node *dnode = (dfilter_node*) (gnode->data);
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GByteArray *barray = dnode->value.bytes;
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g_array_append_val(array, barray);
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean fill_array_boolean_value(GNode *gnode, gpointer data)
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{
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GArray *array = (GArray*)data;
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dfilter_node *dnode = (dfilter_node*) (gnode->data);
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g_array_append_val(array, dnode->value.boolean);
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return FALSE; /* FALSE = do not end traversal of GNode tree */
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}
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gboolean check_relation_numeric(gint operand, GArray *a, GArray *b)
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{
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int i, j, len_a, len_b;
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guint32 val_a;
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len_a = a->len;
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len_b = b->len;
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switch(operand) {
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case TOK_EQ:
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for(i = 0; i < len_a; i++) {
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val_a = g_array_index(a, guint32, i);
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for (j = 0; j < len_b; j++) {
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if (val_a == g_array_index(b, guint32, j))
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return TRUE;
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}
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}
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return FALSE;
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case TOK_NE:
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for(i = 0; i < len_a; i++) {
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val_a = g_array_index(a, guint32, i);
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for (j = 0; j < len_b; j++) {
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if (val_a != g_array_index(b, guint32, j))
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return TRUE;
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}
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}
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return FALSE;
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case TOK_GT:
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for(i = 0; i < len_a; i++) {
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val_a = g_array_index(a, guint32, i);
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for (j = 0; j < len_b; j++) {
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if (val_a > g_array_index(b, guint32, j))
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|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_GE:
|
|
for(i = 0; i < len_a; i++) {
|
|
val_a = g_array_index(a, guint32, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
if (val_a >= g_array_index(b, guint32, j))
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_LT:
|
|
for(i = 0; i < len_a; i++) {
|
|
val_a = g_array_index(a, guint32, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
if (val_a < g_array_index(b, guint32, j))
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_LE:
|
|
for(i = 0; i < len_a; i++) {
|
|
val_a = g_array_index(a, guint32, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
if (val_a <= g_array_index(b, guint32, j))
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
g_assert_not_reached();
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
gboolean check_relation_ether(gint operand, GArray *a, GArray *b)
|
|
{
|
|
int i, j, len_a, len_b;
|
|
guint8 *ptr_a, *ptr_b;
|
|
|
|
len_a = a->len;
|
|
len_b = b->len;
|
|
|
|
|
|
switch(operand) {
|
|
case TOK_EQ:
|
|
for(i = 0; i < len_a; i++) {
|
|
ptr_a = g_array_index_ptr(a, 6, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
ptr_b = g_array_index_ptr(b, 6, j);
|
|
if (memcmp(ptr_a, ptr_b, 6) == 0)
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_NE:
|
|
for(i = 0; i < len_a; i++) {
|
|
ptr_a = g_array_index_ptr(a, 6, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
ptr_b = g_array_index_ptr(b, 6, j);
|
|
if (memcmp(ptr_a, ptr_b, 6) != 0)
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
g_assert_not_reached();
|
|
return FALSE;
|
|
}
|
|
|
|
gboolean check_relation_bytes(gint operand, GArray *a, GArray *b)
|
|
{
|
|
int i, j, len_a, len_b;
|
|
GByteArray *ptr_a,*ptr_b;
|
|
|
|
len_a = a->len;
|
|
len_b = b->len;
|
|
|
|
|
|
switch(operand) {
|
|
case TOK_EQ:
|
|
for(i = 0; i < len_a; i++) {
|
|
ptr_a = g_array_index(a, GByteArray*, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
ptr_b = g_array_index(b, GByteArray*, j);
|
|
if (memcmp(ptr_a->data, ptr_b->data, bytes_length) == 0)
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_NE:
|
|
for(i = 0; i < len_a; i++) {
|
|
ptr_a = g_array_index(a, GByteArray*, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
ptr_b = g_array_index(b, GByteArray*, j);
|
|
if (memcmp(ptr_a->data, ptr_b->data, bytes_length) != 0)
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_GT:
|
|
for(i = 0; i < len_a; i++) {
|
|
ptr_a = g_array_index(a, GByteArray*, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
ptr_b = g_array_index(b, GByteArray*, j);
|
|
if (memcmp(ptr_a->data, ptr_b->data, bytes_length) > 0)
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_LT:
|
|
for(i = 0; i < len_a; i++) {
|
|
ptr_a = g_array_index(a, GByteArray*, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
ptr_b = g_array_index(b, GByteArray*, j);
|
|
if (memcmp(ptr_a->data, ptr_b->data, bytes_length) < 0)
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
}
|
|
|
|
g_assert_not_reached();
|
|
return FALSE;
|
|
}
|
|
|
|
gboolean check_relation_boolean(gint operand, GArray *a, GArray *b)
|
|
{
|
|
int i, j, len_a, len_b;
|
|
guint32 val_a;
|
|
|
|
len_a = a->len;
|
|
len_b = b->len;
|
|
|
|
|
|
switch(operand) {
|
|
case TOK_EQ:
|
|
for(i = 0; i < len_a; i++) {
|
|
val_a = g_array_index(a, guint32, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
if (val_a == g_array_index(b, guint32, j))
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
case TOK_NE:
|
|
for(i = 0; i < len_a; i++) {
|
|
val_a = g_array_index(a, guint32, i);
|
|
for (j = 0; j < len_b; j++) {
|
|
if (val_a != g_array_index(b, guint32, j))
|
|
return TRUE;
|
|
}
|
|
}
|
|
return FALSE;
|
|
|
|
default:
|
|
g_assert_not_reached();
|
|
}
|
|
|
|
g_assert_not_reached();
|
|
return FALSE;
|
|
}
|
|
|