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