Commit | Line | Data |
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dcd5daf2 JG |
1 | /* |
2 | * filter-visitor-ir-validate-string.c | |
3 | * | |
4 | * LTTng filter IR validate string | |
5 | * | |
ab5be9fa | 6 | * Copyright 2014 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
dcd5daf2 | 7 | * |
ab5be9fa | 8 | * SPDX-License-Identifier: LGPL-2.1-only |
dcd5daf2 | 9 | * |
dcd5daf2 JG |
10 | */ |
11 | ||
12 | #include <stdio.h> | |
13 | #include <unistd.h> | |
14 | #include <string.h> | |
15 | #include <stdlib.h> | |
dcd5daf2 | 16 | #include <inttypes.h> |
ed4549a1 DG |
17 | |
18 | #include <common/macros.h> | |
edf4b93e | 19 | #include <common/compat/errno.h> |
ed4549a1 | 20 | |
dcd5daf2 JG |
21 | #include "filter-ast.h" |
22 | #include "filter-parser.h" | |
23 | #include "filter-ir.h" | |
24 | ||
25 | enum parse_char_result { | |
26 | PARSE_CHAR_UNKNOWN = -2, | |
27 | PARSE_CHAR_WILDCARD = -1, | |
28 | PARSE_CHAR_NORMAL = 0, | |
29 | }; | |
30 | ||
31 | static | |
32 | enum parse_char_result parse_char(const char **p) | |
33 | { | |
34 | switch (**p) { | |
35 | case '\\': | |
36 | (*p)++; | |
37 | switch (**p) { | |
38 | case '\\': | |
39 | case '*': | |
40 | return PARSE_CHAR_NORMAL; | |
41 | default: | |
42 | return PARSE_CHAR_UNKNOWN; | |
43 | } | |
44 | case '*': | |
45 | return PARSE_CHAR_WILDCARD; | |
46 | default: | |
47 | return PARSE_CHAR_NORMAL; | |
48 | } | |
49 | } | |
50 | ||
51 | static | |
52 | int validate_string(struct ir_op *node) | |
53 | { | |
54 | switch (node->op) { | |
55 | case IR_OP_UNKNOWN: | |
56 | default: | |
57 | fprintf(stderr, "[error] %s: unknown op type\n", __func__); | |
58 | return -EINVAL; | |
59 | ||
60 | case IR_OP_ROOT: | |
61 | return validate_string(node->u.root.child); | |
62 | case IR_OP_LOAD: | |
63 | { | |
64 | int ret = 0; | |
65 | ||
66 | if (node->data_type == IR_DATA_STRING) { | |
67 | const char *str; | |
68 | ||
a0377dfe | 69 | LTTNG_ASSERT(node->u.load.u.string.value); |
9f449915 | 70 | str = node->u.load.u.string.value; |
dcd5daf2 | 71 | |
dcd5daf2 JG |
72 | for (;;) { |
73 | enum parse_char_result res; | |
74 | ||
75 | if (!(*str)) { | |
76 | break; | |
77 | } | |
78 | ||
79 | res = parse_char(&str); | |
80 | str++; | |
81 | ||
82 | switch (res) { | |
dcd5daf2 JG |
83 | case PARSE_CHAR_UNKNOWN: |
84 | ret = -EINVAL; | |
85 | fprintf(stderr, | |
86 | "Unsupported escape character detected.\n"); | |
87 | goto end_load; | |
88 | case PARSE_CHAR_NORMAL: | |
89 | default: | |
90 | break; | |
91 | } | |
92 | } | |
93 | } | |
94 | end_load: | |
95 | return ret; | |
96 | } | |
97 | case IR_OP_UNARY: | |
98 | return validate_string(node->u.unary.child); | |
99 | case IR_OP_BINARY: | |
100 | { | |
101 | int ret = validate_string(node->u.binary.left); | |
102 | ||
103 | if (ret) | |
104 | return ret; | |
105 | return validate_string(node->u.binary.right); | |
106 | } | |
107 | case IR_OP_LOGICAL: | |
108 | { | |
109 | int ret; | |
110 | ||
111 | ret = validate_string(node->u.logical.left); | |
112 | if (ret) | |
113 | return ret; | |
114 | return validate_string(node->u.logical.right); | |
115 | } | |
116 | } | |
117 | } | |
118 | ||
119 | int filter_visitor_ir_validate_string(struct filter_parser_ctx *ctx) | |
120 | { | |
121 | return validate_string(ctx->ir_root); | |
122 | } |