Commit | Line | Data |
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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> |
17 | ||
c9e313bc SM |
18 | #include <common/compat/errno.hpp> |
19 | #include <common/macros.hpp> | |
9f449915 | 20 | |
c9e313bc | 21 | #include "filter-ast.hpp" |
348ddc5c | 22 | #include "filter-parser.hpp" |
c9e313bc | 23 | #include "filter-ir.hpp" |
9f449915 PP |
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 | } |