[lttng-tools.git] / src / common / filter / filter-visitor-ir-validate-globbing.c

/*
 * filter-visitor-ir-validate-globbing.c
 *
 * LTTng filter IR validate globbing
 *
 * Copyright 2017 Philippe Proulx <pproulx@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>

#include <common/compat/errno.h>
#include <common/macros.h>

#include "filter-ast.h"
#include "filter-parser.h"
#include "filter-ir.h"

static
int validate_globbing(struct ir_op *node)
{
	int ret;

	switch (node->op) {
	case IR_OP_UNKNOWN:
	default:
		fprintf(stderr, "[error] %s: unknown op type\n", __func__);
		return -EINVAL;

	case IR_OP_ROOT:
		return validate_globbing(node->u.root.child);
	case IR_OP_LOAD:
		return 0;
	case IR_OP_UNARY:
		return validate_globbing(node->u.unary.child);
	case IR_OP_BINARY:
	{
		struct ir_op *left = node->u.binary.left;
		struct ir_op *right = node->u.binary.right;

		if (left->op == IR_OP_LOAD && right->op == IR_OP_LOAD &&
				left->data_type == IR_DATA_STRING &&
				right->data_type == IR_DATA_STRING) {
			/* Test 1. */
			if (left->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR &&
					right->u.load.u.string.type != IR_LOAD_STRING_TYPE_PLAIN) {
				fprintf(stderr, "[error] Cannot compare two globbing patterns\n");
				return -1;
			}

			if (right->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR &&
					left->u.load.u.string.type != IR_LOAD_STRING_TYPE_PLAIN) {
				fprintf(stderr, "[error] Cannot compare two globbing patterns\n");
				return -1;
			}
		}

		if ((left->op == IR_OP_LOAD && left->data_type == IR_DATA_STRING) ||
				(right->op == IR_OP_LOAD && right->data_type == IR_DATA_STRING)) {
			if ((left->op == IR_OP_LOAD && left->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR) ||
					(right->op == IR_OP_LOAD && right->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR)) {
				/* Test 2. */
				if (node->u.binary.type != AST_OP_EQ &&
						node->u.binary.type != AST_OP_NE) {
					fprintf(stderr, "[error] Only the `==` and `!=` operators are allowed with a globbing pattern\n");
					return -1;
				}
			}
		}

		ret = validate_globbing(left);
		if (ret) {
			return ret;
		}

		return validate_globbing(right);
	}
	case IR_OP_LOGICAL:
		ret = validate_globbing(node->u.logical.left);
		if (ret)
			return ret;
		return validate_globbing(node->u.logical.right);
	}
}

/*
 * This function recursively validates that:
 *
 * 1. When there's a binary operation between two literal strings,
 *    if one of them has the IR_LOAD_STRING_TYPE_GLOB_STAR type,
 *    the other one has the IR_LOAD_STRING_TYPE_PLAIN type.
 *
 *    In other words, you cannot compare two globbing patterns, except
 *    for two globbing patterns with only a star at the end for backward
 *    compatibility reasons.
 *
 * 2. When there's a binary operation between two literal strings, if
 *    one of them is a (full) star globbing pattern, the binary
 *    operation is either == or !=.
 */
int filter_visitor_ir_validate_globbing(struct filter_parser_ctx *ctx)
{
	return validate_globbing(ctx->ir_root);
}
Commit	Line	Data
9f449915 PP	1	/*
	2	* filter-visitor-ir-validate-globbing.c
	3	*
	4	* LTTng filter IR validate globbing
	5	*
ab5be9fa	6	* Copyright 2017 Philippe Proulx <pproulx@efficios.com>
9f449915	7	*
ab5be9fa	8	* SPDX-License-Identifier: LGPL-2.1-only
9f449915	9	*
9f449915 PP	10	*/
	11
	12	#include <stdio.h>
	13	#include <unistd.h>
	14	#include <string.h>
	15	#include <stdlib.h>
9f449915 PP	16	#include <inttypes.h>
9f449915 PP	17
edf4b93e	18	#include <common/compat/errno.h>
9f449915 PP	19	#include <common/macros.h>
	20
	21	#include "filter-ast.h"
	22	#include "filter-parser.h"
	23	#include "filter-ir.h"
	24
	25	static
	26	int validate_globbing(struct ir_op *node)
	27	{
	28	int ret;
	29
	30	switch (node->op) {
	31	case IR_OP_UNKNOWN:
	32	default:
	33	fprintf(stderr, "[error] %s: unknown op type\n", __func__);
	34	return -EINVAL;
	35
	36	case IR_OP_ROOT:
	37	return validate_globbing(node->u.root.child);
	38	case IR_OP_LOAD:
	39	return 0;
	40	case IR_OP_UNARY:
	41	return validate_globbing(node->u.unary.child);
	42	case IR_OP_BINARY:
	43	{
	44	struct ir_op *left = node->u.binary.left;
	45	struct ir_op *right = node->u.binary.right;
	46
	47	if (left->op == IR_OP_LOAD && right->op == IR_OP_LOAD &&
	48	left->data_type == IR_DATA_STRING &&
	49	right->data_type == IR_DATA_STRING) {
	50	/* Test 1. */
	51	if (left->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR &&
	52	right->u.load.u.string.type != IR_LOAD_STRING_TYPE_PLAIN) {
	53	fprintf(stderr, "[error] Cannot compare two globbing patterns\n");
	54	return -1;
	55	}
	56
	57	if (right->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR &&
	58	left->u.load.u.string.type != IR_LOAD_STRING_TYPE_PLAIN) {
	59	fprintf(stderr, "[error] Cannot compare two globbing patterns\n");
	60	return -1;
	61	}
	62	}
	63
	64	if ((left->op == IR_OP_LOAD && left->data_type == IR_DATA_STRING) \|\|
	65	(right->op == IR_OP_LOAD && right->data_type == IR_DATA_STRING)) {
	66	if ((left->op == IR_OP_LOAD && left->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR) \|\|
	67	(right->op == IR_OP_LOAD && right->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR)) {
	68	/* Test 2. */
	69	if (node->u.binary.type != AST_OP_EQ &&
	70	node->u.binary.type != AST_OP_NE) {
	71	fprintf(stderr, "[error] Only the `==` and `!=` operators are allowed with a globbing pattern\n");
	72	return -1;
	73	}
	74	}
	75	}
	76
	77	ret = validate_globbing(left);
	78	if (ret) {
	79	return ret;
	80	}
	81
	82	return validate_globbing(right);
83	}
84	case IR_OP_LOGICAL:
85	ret = validate_globbing(node->u.logical.left);
86	if (ret)
87	return ret;
88	return validate_globbing(node->u.logical.right);
89	}
90	}
91
92	/*
93	* This function recursively validates that:
94	*
95	* 1. When there's a binary operation between two literal strings,
96	* if one of them has the IR_LOAD_STRING_TYPE_GLOB_STAR type,
97	* the other one has the IR_LOAD_STRING_TYPE_PLAIN type.
98	*
99	* In other words, you cannot compare two globbing patterns, except
100	* for two globbing patterns with only a star at the end for backward
101	* compatibility reasons.
102	*
103	* 2. When there's a binary operation between two literal strings, if
104	* one of them is a (full) star globbing pattern, the binary
105	* operation is either == or !=.
106	*/
9f449915 PP	107	int filter_visitor_ir_validate_globbing(struct filter_parser_ctx *ctx)
	108	{
	109	return validate_globbing(ctx->ir_root);
	110	}