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de1c301e LP |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2013 Lennart Poettering | |
5 | ||
6 | systemd is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU Lesser General Public License as published by | |
8 | the Free Software Foundation; either version 2.1 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | systemd is distributed in the hope that it will be useful, but | |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public License | |
17 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
18 | ***/ | |
19 | ||
20 | #include <util.h> | |
21 | ||
22 | #include "bus-signature.h" | |
23 | #include "bus-type.h" | |
24 | ||
25 | static int signature_element_length_internal( | |
26 | const char *s, | |
27 | bool allow_dict_entry, | |
813a4f93 LP |
28 | unsigned array_depth, |
29 | unsigned struct_depth, | |
de1c301e LP |
30 | size_t *l) { |
31 | ||
32 | int r; | |
33 | ||
35460afc LP |
34 | if (!s) |
35 | return -EINVAL; | |
36 | ||
718db961 | 37 | assert(l); |
de1c301e LP |
38 | |
39 | if (bus_type_is_basic(*s) || *s == SD_BUS_TYPE_VARIANT) { | |
40 | *l = 1; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | if (*s == SD_BUS_TYPE_ARRAY) { | |
45 | size_t t; | |
46 | ||
813a4f93 LP |
47 | if (array_depth >= 32) |
48 | return -EINVAL; | |
49 | ||
50 | r = signature_element_length_internal(s + 1, true, array_depth+1, struct_depth, &t); | |
de1c301e LP |
51 | if (r < 0) |
52 | return r; | |
53 | ||
54 | *l = t + 1; | |
55 | return 0; | |
56 | } | |
57 | ||
58 | if (*s == SD_BUS_TYPE_STRUCT_BEGIN) { | |
59 | const char *p = s + 1; | |
60 | ||
813a4f93 LP |
61 | if (struct_depth >= 32) |
62 | return -EINVAL; | |
63 | ||
de1c301e LP |
64 | while (*p != SD_BUS_TYPE_STRUCT_END) { |
65 | size_t t; | |
66 | ||
813a4f93 | 67 | r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t); |
de1c301e LP |
68 | if (r < 0) |
69 | return r; | |
70 | ||
71 | p += t; | |
72 | } | |
73 | ||
74 | *l = p - s + 1; | |
75 | return 0; | |
76 | } | |
77 | ||
78 | if (*s == SD_BUS_TYPE_DICT_ENTRY_BEGIN && allow_dict_entry) { | |
79 | const char *p = s + 1; | |
80 | unsigned n = 0; | |
81 | ||
813a4f93 LP |
82 | if (struct_depth >= 32) |
83 | return -EINVAL; | |
84 | ||
de1c301e LP |
85 | while (*p != SD_BUS_TYPE_DICT_ENTRY_END) { |
86 | size_t t; | |
87 | ||
88 | if (n == 0 && !bus_type_is_basic(*p)) | |
89 | return -EINVAL; | |
90 | ||
813a4f93 | 91 | r = signature_element_length_internal(p, false, array_depth, struct_depth+1, &t); |
de1c301e LP |
92 | if (r < 0) |
93 | return r; | |
94 | ||
95 | p += t; | |
96 | n++; | |
97 | } | |
98 | ||
99 | if (n != 2) | |
100 | return -EINVAL; | |
101 | ||
102 | *l = p - s + 1; | |
103 | return 0; | |
104 | } | |
105 | ||
106 | return -EINVAL; | |
107 | } | |
108 | ||
813a4f93 LP |
109 | |
110 | int signature_element_length(const char *s, size_t *l) { | |
111 | return signature_element_length_internal(s, true, 0, 0, l); | |
112 | } | |
113 | ||
29ddb38f | 114 | bool signature_is_single(const char *s, bool allow_dict_entry) { |
de1c301e LP |
115 | int r; |
116 | size_t t; | |
117 | ||
35460afc LP |
118 | if (!s) |
119 | return false; | |
de1c301e | 120 | |
29ddb38f | 121 | r = signature_element_length_internal(s, allow_dict_entry, 0, 0, &t); |
de1c301e LP |
122 | if (r < 0) |
123 | return false; | |
124 | ||
125 | return s[t] == 0; | |
126 | } | |
127 | ||
128 | bool signature_is_pair(const char *s) { | |
718db961 | 129 | |
35460afc LP |
130 | if (!s) |
131 | return false; | |
de1c301e LP |
132 | |
133 | if (!bus_type_is_basic(*s)) | |
134 | return false; | |
135 | ||
29ddb38f | 136 | return signature_is_single(s + 1, false); |
de1c301e LP |
137 | } |
138 | ||
139 | bool signature_is_valid(const char *s, bool allow_dict_entry) { | |
140 | const char *p; | |
141 | int r; | |
142 | ||
35460afc LP |
143 | if (!s) |
144 | return false; | |
de1c301e LP |
145 | |
146 | p = s; | |
147 | while (*p) { | |
148 | size_t t; | |
149 | ||
813a4f93 | 150 | r = signature_element_length_internal(p, allow_dict_entry, 0, 0, &t); |
de1c301e LP |
151 | if (r < 0) |
152 | return false; | |
153 | ||
154 | p += t; | |
155 | } | |
156 | ||
157 | return p - s <= 255; | |
158 | } |