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1 | /* |
2 | * filter-visitor-ir-validate-globbing.c | |
3 | * | |
4 | * LTTng filter IR validate globbing | |
5 | * | |
6 | * Copyright 2017 - Philippe Proulx <pproulx@efficios.com> | |
7 | * | |
8 | * This library is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
10 | * as published by the Free Software Foundation. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software Foundation, | |
19 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <unistd.h> | |
24 | #include <string.h> | |
25 | #include <stdlib.h> | |
26 | #include <assert.h> | |
27 | #include <errno.h> | |
28 | #include <inttypes.h> | |
29 | ||
30 | #include <common/macros.h> | |
31 | ||
32 | #include "filter-ast.h" | |
33 | #include "filter-parser.h" | |
34 | #include "filter-ir.h" | |
35 | ||
36 | static | |
37 | int validate_globbing(struct ir_op *node) | |
38 | { | |
39 | int ret; | |
40 | ||
41 | switch (node->op) { | |
42 | case IR_OP_UNKNOWN: | |
43 | default: | |
44 | fprintf(stderr, "[error] %s: unknown op type\n", __func__); | |
45 | return -EINVAL; | |
46 | ||
47 | case IR_OP_ROOT: | |
48 | return validate_globbing(node->u.root.child); | |
49 | case IR_OP_LOAD: | |
50 | return 0; | |
51 | case IR_OP_UNARY: | |
52 | return validate_globbing(node->u.unary.child); | |
53 | case IR_OP_BINARY: | |
54 | { | |
55 | struct ir_op *left = node->u.binary.left; | |
56 | struct ir_op *right = node->u.binary.right; | |
57 | ||
58 | if (left->op == IR_OP_LOAD && right->op == IR_OP_LOAD && | |
59 | left->data_type == IR_DATA_STRING && | |
60 | right->data_type == IR_DATA_STRING) { | |
61 | /* Test 1. */ | |
62 | if (left->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR && | |
63 | right->u.load.u.string.type != IR_LOAD_STRING_TYPE_PLAIN) { | |
64 | fprintf(stderr, "[error] Cannot compare two globbing patterns\n"); | |
65 | return -1; | |
66 | } | |
67 | ||
68 | if (right->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR && | |
69 | left->u.load.u.string.type != IR_LOAD_STRING_TYPE_PLAIN) { | |
70 | fprintf(stderr, "[error] Cannot compare two globbing patterns\n"); | |
71 | return -1; | |
72 | } | |
73 | } | |
74 | ||
75 | if ((left->op == IR_OP_LOAD && left->data_type == IR_DATA_STRING) || | |
76 | (right->op == IR_OP_LOAD && right->data_type == IR_DATA_STRING)) { | |
77 | if ((left->op == IR_OP_LOAD && left->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR) || | |
78 | (right->op == IR_OP_LOAD && right->u.load.u.string.type == IR_LOAD_STRING_TYPE_GLOB_STAR)) { | |
79 | /* Test 2. */ | |
80 | if (node->u.binary.type != AST_OP_EQ && | |
81 | node->u.binary.type != AST_OP_NE) { | |
82 | fprintf(stderr, "[error] Only the `==` and `!=` operators are allowed with a globbing pattern\n"); | |
83 | return -1; | |
84 | } | |
85 | } | |
86 | } | |
87 | ||
88 | ret = validate_globbing(left); | |
89 | if (ret) { | |
90 | return ret; | |
91 | } | |
92 | ||
93 | return validate_globbing(right); | |
94 | } | |
95 | case IR_OP_LOGICAL: | |
96 | ret = validate_globbing(node->u.logical.left); | |
97 | if (ret) | |
98 | return ret; | |
99 | return validate_globbing(node->u.logical.right); | |
100 | } | |
101 | } | |
102 | ||
103 | /* | |
104 | * This function recursively validates that: | |
105 | * | |
106 | * 1. When there's a binary operation between two literal strings, | |
107 | * if one of them has the IR_LOAD_STRING_TYPE_GLOB_STAR type, | |
108 | * the other one has the IR_LOAD_STRING_TYPE_PLAIN type. | |
109 | * | |
110 | * In other words, you cannot compare two globbing patterns, except | |
111 | * for two globbing patterns with only a star at the end for backward | |
112 | * compatibility reasons. | |
113 | * | |
114 | * 2. When there's a binary operation between two literal strings, if | |
115 | * one of them is a (full) star globbing pattern, the binary | |
116 | * operation is either == or !=. | |
117 | */ | |
118 | LTTNG_HIDDEN | |
119 | int filter_visitor_ir_validate_globbing(struct filter_parser_ctx *ctx) | |
120 | { | |
121 | return validate_globbing(ctx->ir_root); | |
122 | } |