739 lines
16 KiB
C
739 lines
16 KiB
C
/*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 2001 Gerald Combs
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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 "dfvm.h"
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#include <ftypes/ftypes-int.h>
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#include <wsutil/ws_assert.h>
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dfvm_insn_t*
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dfvm_insn_new(dfvm_opcode_t op)
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{
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dfvm_insn_t *insn;
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insn = g_new(dfvm_insn_t, 1);
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insn->op = op;
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insn->arg1 = NULL;
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insn->arg2 = NULL;
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insn->arg3 = NULL;
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insn->arg4 = NULL;
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return insn;
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}
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static void
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dfvm_value_free(dfvm_value_t *v)
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{
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switch (v->type) {
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case FVALUE:
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FVALUE_FREE(v->value.fvalue);
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break;
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case DRANGE:
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drange_free(v->value.drange);
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break;
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case PCRE:
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fvalue_regex_free(v->value.pcre);
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break;
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default:
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/* nothing */
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;
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}
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g_free(v);
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}
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void
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dfvm_insn_free(dfvm_insn_t *insn)
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{
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if (insn->arg1) {
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dfvm_value_free(insn->arg1);
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}
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if (insn->arg2) {
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dfvm_value_free(insn->arg2);
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}
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if (insn->arg3) {
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dfvm_value_free(insn->arg3);
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}
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if (insn->arg4) {
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dfvm_value_free(insn->arg4);
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}
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g_free(insn);
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}
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dfvm_value_t*
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dfvm_value_new(dfvm_value_type_t type)
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{
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dfvm_value_t *v;
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v = g_new(dfvm_value_t, 1);
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v->type = type;
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return v;
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}
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void
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dfvm_dump(FILE *f, dfilter_t *df)
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{
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int id, length;
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dfvm_insn_t *insn;
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dfvm_value_t *arg1;
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dfvm_value_t *arg2;
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dfvm_value_t *arg3;
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dfvm_value_t *arg4;
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char *value_str;
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GSList *range_list;
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drange_node *range_item;
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/* First dump the constant initializations */
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fprintf(f, "Constants:\n");
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length = df->consts->len;
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for (id = 0; id < length; id++) {
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insn = (dfvm_insn_t *)g_ptr_array_index(df->consts, id);
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arg1 = insn->arg1;
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arg2 = insn->arg2;
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switch (insn->op) {
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case PUT_FVALUE:
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value_str = fvalue_to_string_repr(NULL, arg1->value.fvalue,
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FTREPR_DFILTER, BASE_NONE);
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fprintf(f, "%05d PUT_FVALUE\t%s <%s> -> reg#%u\n",
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id, value_str,
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fvalue_type_name(arg1->value.fvalue),
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arg2->value.numeric);
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wmem_free(NULL, value_str);
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break;
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case PUT_PCRE:
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fprintf(f, "%05d PUT_PCRE \t%s <GRegex> -> reg#%u\n",
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id,
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fvalue_regex_pattern(arg1->value.pcre),
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arg2->value.numeric);
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break;
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case CHECK_EXISTS:
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case READ_TREE:
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case CALL_FUNCTION:
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case MK_RANGE:
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case ANY_EQ:
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case ANY_NE:
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case ANY_GT:
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case ANY_GE:
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case ANY_LT:
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case ANY_LE:
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case ANY_BITWISE_AND:
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case ANY_CONTAINS:
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case ANY_MATCHES:
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case ANY_IN_RANGE:
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case NOT:
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case RETURN:
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case IF_TRUE_GOTO:
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case IF_FALSE_GOTO:
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default:
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ws_assert_not_reached();
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break;
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}
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}
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fprintf(f, "\nInstructions:\n");
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/* Now dump the operations */
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length = df->insns->len;
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for (id = 0; id < length; id++) {
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insn = (dfvm_insn_t *)g_ptr_array_index(df->insns, id);
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arg1 = insn->arg1;
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arg2 = insn->arg2;
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arg3 = insn->arg3;
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arg4 = insn->arg4;
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switch (insn->op) {
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case CHECK_EXISTS:
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fprintf(f, "%05d CHECK_EXISTS\t%s\n",
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id, arg1->value.hfinfo->abbrev);
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break;
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case READ_TREE:
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fprintf(f, "%05d READ_TREE\t\t%s -> reg#%u\n",
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id, arg1->value.hfinfo->abbrev,
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arg2->value.numeric);
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break;
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case CALL_FUNCTION:
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fprintf(f, "%05d CALL_FUNCTION\t%s (",
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id, arg1->value.funcdef->name);
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if (arg3) {
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fprintf(f, "reg#%u", arg3->value.numeric);
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}
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if (arg4) {
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fprintf(f, ", reg#%u", arg4->value.numeric);
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}
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fprintf(f, ") --> reg#%u\n", arg2->value.numeric);
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break;
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case PUT_FVALUE:
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/* We already dumped these */
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ws_assert_not_reached();
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break;
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case PUT_PCRE:
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/* We already dumped these */
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g_assert_not_reached();
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break;
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case MK_RANGE:
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arg3 = insn->arg3;
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fprintf(f, "%05d MK_RANGE\t\treg#%u[",
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id,
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arg1->value.numeric);
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for (range_list = arg3->value.drange->range_list;
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range_list != NULL;
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range_list = range_list->next) {
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range_item = (drange_node *)range_list->data;
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switch (range_item->ending) {
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case DRANGE_NODE_END_T_UNINITIALIZED:
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fprintf(f, "?");
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break;
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case DRANGE_NODE_END_T_LENGTH:
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fprintf(f, "%d:%d",
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range_item->start_offset,
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range_item->length);
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break;
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case DRANGE_NODE_END_T_OFFSET:
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fprintf(f, "%d-%d",
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range_item->start_offset,
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range_item->end_offset);
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break;
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case DRANGE_NODE_END_T_TO_THE_END:
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fprintf(f, "%d:",
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range_item->start_offset);
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break;
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}
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if (range_list->next != NULL)
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fprintf(f, ",");
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}
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fprintf(f, "] -> reg#%u\n",
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arg2->value.numeric);
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break;
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case ANY_EQ:
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fprintf(f, "%05d ANY_EQ\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_NE:
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fprintf(f, "%05d ANY_NE\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_GT:
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fprintf(f, "%05d ANY_GT\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_GE:
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fprintf(f, "%05d ANY_GE\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_LT:
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fprintf(f, "%05d ANY_LT\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_LE:
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fprintf(f, "%05d ANY_LE\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_BITWISE_AND:
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fprintf(f, "%05d ANY_BITWISE_AND\t\treg#%u == reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_CONTAINS:
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fprintf(f, "%05d ANY_CONTAINS\treg#%u contains reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_MATCHES:
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fprintf(f, "%05d ANY_MATCHES\treg#%u matches reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric);
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break;
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case ANY_IN_RANGE:
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fprintf(f, "%05d ANY_IN_RANGE\treg#%u in range reg#%u,reg#%u\n",
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id, arg1->value.numeric, arg2->value.numeric,
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arg3->value.numeric);
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break;
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case NOT:
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fprintf(f, "%05d NOT\n", id);
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break;
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case RETURN:
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fprintf(f, "%05d RETURN\n", id);
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break;
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case IF_TRUE_GOTO:
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fprintf(f, "%05d IF-TRUE-GOTO\t%u\n",
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id, arg1->value.numeric);
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break;
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case IF_FALSE_GOTO:
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fprintf(f, "%05d IF-FALSE-GOTO\t%u\n",
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id, arg1->value.numeric);
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break;
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default:
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ws_assert_not_reached();
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break;
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}
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}
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}
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/* Reads a field from the proto_tree and loads the fvalues into a register,
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* if that field has not already been read. */
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static gboolean
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read_tree(dfilter_t *df, proto_tree *tree, header_field_info *hfinfo, int reg)
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{
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GPtrArray *finfos;
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field_info *finfo;
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int i, len;
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GList *fvalues = NULL;
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gboolean found_something = FALSE;
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/* Already loaded in this run of the dfilter? */
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if (df->attempted_load[reg]) {
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if (df->registers[reg]) {
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return TRUE;
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}
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else {
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return FALSE;
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}
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}
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df->attempted_load[reg] = TRUE;
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while (hfinfo) {
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finfos = proto_get_finfo_ptr_array(tree, hfinfo->id);
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if ((finfos == NULL) || (g_ptr_array_len(finfos) == 0)) {
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hfinfo = hfinfo->same_name_next;
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continue;
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}
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else {
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found_something = TRUE;
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}
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len = finfos->len;
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for (i = 0; i < len; i++) {
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finfo = (field_info *)g_ptr_array_index(finfos, i);
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fvalues = g_list_prepend(fvalues, &finfo->value);
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}
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hfinfo = hfinfo->same_name_next;
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}
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if (!found_something) {
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return FALSE;
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}
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df->registers[reg] = fvalues;
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// These values are referenced only, do not try to free it later.
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df->owns_memory[reg] = FALSE;
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return TRUE;
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}
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/* Put a constant value in a register. These will not be cleared by
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* free_register_overhead. */
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static gboolean
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put_fvalue(dfilter_t *df, fvalue_t *fv, int reg)
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{
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df->registers[reg] = g_list_append(NULL, fv);
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df->owns_memory[reg] = FALSE;
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return TRUE;
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}
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/* Put a constant PCRE in a register. These will not be cleared by
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* free_register_overhead. */
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static gboolean
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put_pcre(dfilter_t *df, fvalue_regex_t *pcre, int reg)
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{
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df->registers[reg] = g_list_append(NULL, pcre);
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df->owns_memory[reg] = FALSE;
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return TRUE;
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}
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typedef gboolean (*FvalueCmpFunc)(const fvalue_t*, const fvalue_t*);
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static gboolean
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any_test(dfilter_t *df, FvalueCmpFunc cmp, int reg1, int reg2)
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{
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GList *list_a, *list_b;
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list_a = df->registers[reg1];
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while (list_a) {
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list_b = df->registers[reg2];
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while (list_b) {
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if (cmp((fvalue_t *)list_a->data, (fvalue_t *)list_b->data)) {
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return TRUE;
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}
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list_b = g_list_next(list_b);
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}
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list_a = g_list_next(list_a);
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}
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return FALSE;
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}
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static gboolean
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any_matches(dfilter_t *df, int reg1, int reg2)
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{
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GList *list_a, *list_b;
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list_a = df->registers[reg1];
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while (list_a) {
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list_b = df->registers[reg2];
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while (list_b) {
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if (fvalue_matches((fvalue_t *)list_a->data, list_b->data)) {
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return TRUE;
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}
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list_b = g_list_next(list_b);
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}
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list_a = g_list_next(list_a);
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}
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return FALSE;
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}
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static gboolean
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any_in_range(dfilter_t *df, int reg1, int reg2, int reg3)
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{
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GList *list1, *list_low, *list_high;
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fvalue_t *low, *high;
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list1 = df->registers[reg1];
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list_low = df->registers[reg2];
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list_high = df->registers[reg3];
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/* The first register contains the values associated with a field, the
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* second and third arguments are expected to be a single value for the
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* lower and upper bound respectively. These cannot be fields and thus
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* the list length MUST be one. This should have been enforced by
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* grammar.lemon.
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*/
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ws_assert(list_low && !g_list_next(list_low));
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ws_assert(list_high && !g_list_next(list_high));
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low = (fvalue_t *)list_low->data;
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high = (fvalue_t *)list_high->data;
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while (list1) {
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fvalue_t *value = (fvalue_t *)list1->data;
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if (fvalue_ge(value, low) && fvalue_le(value, high)) {
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return TRUE;
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}
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list1 = g_list_next(list1);
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}
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return FALSE;
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}
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static void
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free_owned_register(gpointer data, gpointer user_data _U_)
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{
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fvalue_t *value = (fvalue_t *)data;
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FVALUE_FREE(value);
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}
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/* Clear registers that were populated during evaluation (leaving constants
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* intact). If we created the values, then these will be freed as well. */
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static void
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free_register_overhead(dfilter_t* df)
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{
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guint i;
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for (i = 0; i < df->num_registers; i++) {
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df->attempted_load[i] = FALSE;
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if (df->registers[i]) {
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if (df->owns_memory[i]) {
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g_list_foreach(df->registers[i], free_owned_register, NULL);
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df->owns_memory[i] = FALSE;
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}
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g_list_free(df->registers[i]);
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df->registers[i] = NULL;
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}
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}
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}
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/* Takes the list of fvalue_t's in a register, uses fvalue_slice()
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* to make a new list of fvalue_t's (which are ranges, or byte-slices),
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* and puts the new list into a new register. */
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static void
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mk_range(dfilter_t *df, int from_reg, int to_reg, drange_t *d_range)
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{
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GList *from_list, *to_list;
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fvalue_t *old_fv, *new_fv;
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to_list = NULL;
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from_list = df->registers[from_reg];
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while (from_list) {
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old_fv = (fvalue_t*)from_list->data;
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new_fv = fvalue_slice(old_fv, d_range);
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/* Assert here because semcheck.c should have
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* already caught the cases in which a slice
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* cannot be made. */
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ws_assert(new_fv);
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to_list = g_list_append(to_list, new_fv);
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from_list = g_list_next(from_list);
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}
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df->registers[to_reg] = to_list;
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df->owns_memory[to_reg] = TRUE;
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}
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gboolean
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dfvm_apply(dfilter_t *df, proto_tree *tree)
|
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{
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int id, length;
|
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gboolean accum = TRUE;
|
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dfvm_insn_t *insn;
|
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dfvm_value_t *arg1;
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dfvm_value_t *arg2;
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dfvm_value_t *arg3 = NULL;
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dfvm_value_t *arg4 = NULL;
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header_field_info *hfinfo;
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GList *param1;
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GList *param2;
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|
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ws_assert(tree);
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length = df->insns->len;
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|
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for (id = 0; id < length; id++) {
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AGAIN:
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insn = (dfvm_insn_t *)g_ptr_array_index(df->insns, id);
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arg1 = insn->arg1;
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arg2 = insn->arg2;
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|
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switch (insn->op) {
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|
case CHECK_EXISTS:
|
|
hfinfo = arg1->value.hfinfo;
|
|
while(hfinfo) {
|
|
accum = proto_check_for_protocol_or_field(tree,
|
|
hfinfo->id);
|
|
if (accum) {
|
|
break;
|
|
}
|
|
else {
|
|
hfinfo = hfinfo->same_name_next;
|
|
}
|
|
}
|
|
break;
|
|
|
|
case READ_TREE:
|
|
accum = read_tree(df, tree,
|
|
arg1->value.hfinfo, arg2->value.numeric);
|
|
break;
|
|
|
|
case CALL_FUNCTION:
|
|
arg3 = insn->arg3;
|
|
arg4 = insn->arg4;
|
|
param1 = NULL;
|
|
param2 = NULL;
|
|
if (arg3) {
|
|
param1 = df->registers[arg3->value.numeric];
|
|
}
|
|
if (arg4) {
|
|
param2 = df->registers[arg4->value.numeric];
|
|
}
|
|
accum = arg1->value.funcdef->function(param1, param2,
|
|
&df->registers[arg2->value.numeric]);
|
|
// functions create a new value, so own it.
|
|
df->owns_memory[arg2->value.numeric] = TRUE;
|
|
break;
|
|
|
|
case MK_RANGE:
|
|
arg3 = insn->arg3;
|
|
mk_range(df,
|
|
arg1->value.numeric, arg2->value.numeric,
|
|
arg3->value.drange);
|
|
break;
|
|
|
|
case ANY_EQ:
|
|
accum = any_test(df, fvalue_eq,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_NE:
|
|
accum = any_test(df, fvalue_ne,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_GT:
|
|
accum = any_test(df, fvalue_gt,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_GE:
|
|
accum = any_test(df, fvalue_ge,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_LT:
|
|
accum = any_test(df, fvalue_lt,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_LE:
|
|
accum = any_test(df, fvalue_le,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_BITWISE_AND:
|
|
accum = any_test(df, fvalue_bitwise_and,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_CONTAINS:
|
|
accum = any_test(df, fvalue_contains,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_MATCHES:
|
|
accum = any_matches(df,
|
|
arg1->value.numeric, arg2->value.numeric);
|
|
break;
|
|
|
|
case ANY_IN_RANGE:
|
|
arg3 = insn->arg3;
|
|
accum = any_in_range(df, arg1->value.numeric,
|
|
arg2->value.numeric,
|
|
arg3->value.numeric);
|
|
break;
|
|
|
|
case NOT:
|
|
accum = !accum;
|
|
break;
|
|
|
|
case RETURN:
|
|
free_register_overhead(df);
|
|
return accum;
|
|
|
|
case IF_TRUE_GOTO:
|
|
if (accum) {
|
|
id = arg1->value.numeric;
|
|
goto AGAIN;
|
|
}
|
|
break;
|
|
|
|
case IF_FALSE_GOTO:
|
|
if (!accum) {
|
|
id = arg1->value.numeric;
|
|
goto AGAIN;
|
|
}
|
|
break;
|
|
|
|
case PUT_FVALUE:
|
|
#if 0
|
|
/* These were handled in the constants initialization */
|
|
accum = put_fvalue(df,
|
|
arg1->value.fvalue, arg2->value.numeric);
|
|
break;
|
|
#endif
|
|
|
|
case PUT_PCRE:
|
|
#if 0
|
|
/* These were handled in the constants initialization */
|
|
accum = put_pcre(df,
|
|
arg1->value.pcre, arg2->value.numeric);
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ws_assert_not_reached();
|
|
break;
|
|
}
|
|
}
|
|
|
|
ws_assert_not_reached();
|
|
return FALSE; /* to appease the compiler */
|
|
}
|
|
|
|
void
|
|
dfvm_init_const(dfilter_t *df)
|
|
{
|
|
int id, length;
|
|
dfvm_insn_t *insn;
|
|
dfvm_value_t *arg1;
|
|
dfvm_value_t *arg2;
|
|
|
|
length = df->consts->len;
|
|
|
|
for (id = 0; id < length; id++) {
|
|
|
|
insn = (dfvm_insn_t *)g_ptr_array_index(df->consts, id);
|
|
arg1 = insn->arg1;
|
|
arg2 = insn->arg2;
|
|
|
|
switch (insn->op) {
|
|
case PUT_FVALUE:
|
|
put_fvalue(df,
|
|
arg1->value.fvalue, arg2->value.numeric);
|
|
break;
|
|
case PUT_PCRE:
|
|
put_pcre(df,
|
|
arg1->value.pcre, arg2->value.numeric);
|
|
break;
|
|
case CHECK_EXISTS:
|
|
case READ_TREE:
|
|
case CALL_FUNCTION:
|
|
case MK_RANGE:
|
|
case ANY_EQ:
|
|
case ANY_NE:
|
|
case ANY_GT:
|
|
case ANY_GE:
|
|
case ANY_LT:
|
|
case ANY_LE:
|
|
case ANY_BITWISE_AND:
|
|
case ANY_CONTAINS:
|
|
case ANY_MATCHES:
|
|
case ANY_IN_RANGE:
|
|
case NOT:
|
|
case RETURN:
|
|
case IF_TRUE_GOTO:
|
|
case IF_FALSE_GOTO:
|
|
default:
|
|
ws_assert_not_reached();
|
|
break;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|