116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
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* ZMap Copyright 2013 Regents of the University of Michigan
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy
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* of the License at http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include "filter.h"
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#include "state.h"
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#include "lexer.h"
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#include "parser.h"
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#include "expression.h"
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#include "../lib/logger.h"
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#include <string.h>
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extern int yyparse(void);
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node_t *zfilter;
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static int validate_node(node_t *node, fielddefset_t *fields)
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{
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int index, found = 0;
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if (node->type == OP) {
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// These end up getting validated later
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if (node->value.op == AND || node->value.op == OR) {
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return 1;
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}
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// Comparison node (=, >, <, etc.)
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// Validate that the field (left child) exists in the fieldset
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for (index = 0; index < fields->len; index++) {
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if (fields->fielddefs[index].name) {
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if (strcmp(fields->fielddefs[index].name,
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node->left_child->value.field
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.fieldname) == 0) {
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node->left_child->value.field.index =
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index;
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found = 1;
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break;
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}
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}
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}
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if (!found) {
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fprintf(stderr, "Field '%s' does not exist\n",
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node->left_child->value.field.fieldname);
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return 0;
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}
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// Fieldname is fine, match the type.
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switch (node->right_child->type) {
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case STRING:
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if (strcmp(fields->fielddefs[index].type, "string") ==
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0) {
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return 1;
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} else {
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fprintf(stderr,
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"Field '%s' is not of type 'string'\n",
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fields->fielddefs[index].name);
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return 0;
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}
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case INT:
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if (strcmp(fields->fielddefs[index].type, "int") == 0 ||
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strcmp(fields->fielddefs[index].type, "bool") ==
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0) {
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return 1;
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} else {
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fprintf(stderr,
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"Field '%s' is not of type 'int'\n",
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fields->fielddefs[index].name);
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return 0;
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}
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default:
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return 0;
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}
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} else {
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// All non-op nodes are valid
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return 1;
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}
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// Didn't validate
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return 0;
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}
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int parse_filter_string(char *filter)
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{
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YY_BUFFER_STATE buffer_state = yy_scan_string(filter);
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int status = yyparse();
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yy_delete_buffer(buffer_state);
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if (status) {
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// Error
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log_error("zmap", "Unable to parse filter string: '%s'",
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filter);
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return 0;
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}
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zconf.filter.expression = zfilter;
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return 1;
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}
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/*
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* 0 Valid
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* -1 Invalid Field Name
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* -2 Type Mismatch
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*/
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int validate_filter(node_t *root, fielddefset_t *fields)
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{
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int valid;
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if (!root) {
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return 1;
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}
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valid = validate_node(root, fields);
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if (!valid) {
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return 0;
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}
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return (validate_filter(root->left_child, fields) &&
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validate_filter(root->right_child, fields));
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}
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