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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
910fd145 | 2 | /*** |
910fd145 LP |
3 | ***/ |
4 | ||
dccca82b | 5 | #include <errno.h> |
910fd145 | 6 | #include <fcntl.h> |
15b1248a | 7 | #include <unistd.h> |
910fd145 LP |
8 | |
9 | #include "fd-util.h" | |
8ac2f74f | 10 | #include "fs-util.h" |
910fd145 LP |
11 | #include "hexdecoct.h" |
12 | #include "id128-util.h" | |
13 | #include "io-util.h" | |
14 | #include "stdio-util.h" | |
15 | ||
16 | char *id128_to_uuid_string(sd_id128_t id, char s[37]) { | |
17 | unsigned n, k = 0; | |
18 | ||
19 | assert(s); | |
20 | ||
21 | /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */ | |
22 | ||
23 | for (n = 0; n < 16; n++) { | |
24 | ||
25 | if (IN_SET(n, 4, 6, 8, 10)) | |
26 | s[k++] = '-'; | |
27 | ||
28 | s[k++] = hexchar(id.bytes[n] >> 4); | |
29 | s[k++] = hexchar(id.bytes[n] & 0xF); | |
30 | } | |
31 | ||
32 | assert(k == 36); | |
33 | ||
34 | s[k] = 0; | |
35 | ||
36 | return s; | |
37 | } | |
38 | ||
39 | bool id128_is_valid(const char *s) { | |
40 | size_t i, l; | |
41 | ||
42 | assert(s); | |
43 | ||
44 | l = strlen(s); | |
45 | if (l == 32) { | |
46 | ||
47 | /* Plain formatted 128bit hex string */ | |
48 | ||
49 | for (i = 0; i < l; i++) { | |
50 | char c = s[i]; | |
51 | ||
52 | if (!(c >= '0' && c <= '9') && | |
53 | !(c >= 'a' && c <= 'z') && | |
54 | !(c >= 'A' && c <= 'Z')) | |
55 | return false; | |
56 | } | |
57 | ||
58 | } else if (l == 36) { | |
59 | ||
60 | /* Formatted UUID */ | |
61 | ||
62 | for (i = 0; i < l; i++) { | |
63 | char c = s[i]; | |
64 | ||
945c2931 | 65 | if (IN_SET(i, 8, 13, 18, 23)) { |
910fd145 LP |
66 | if (c != '-') |
67 | return false; | |
68 | } else { | |
69 | if (!(c >= '0' && c <= '9') && | |
70 | !(c >= 'a' && c <= 'z') && | |
71 | !(c >= 'A' && c <= 'Z')) | |
72 | return false; | |
73 | } | |
74 | } | |
75 | ||
76 | } else | |
77 | return false; | |
78 | ||
79 | return true; | |
80 | } | |
81 | ||
82 | int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) { | |
83 | char buffer[36 + 2]; | |
84 | ssize_t l; | |
85 | ||
86 | assert(fd >= 0); | |
87 | assert(f < _ID128_FORMAT_MAX); | |
88 | ||
89 | /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both | |
65548c58 LP |
90 | * optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they |
91 | * aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you | |
92 | * accept". */ | |
910fd145 | 93 | |
65548c58 | 94 | l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */ |
910fd145 LP |
95 | if (l < 0) |
96 | return (int) l; | |
97 | if (l == 0) /* empty? */ | |
98 | return -ENOMEDIUM; | |
99 | ||
65548c58 | 100 | switch (l) { |
910fd145 | 101 | |
65548c58 | 102 | case 33: /* plain UUID with trailing newline */ |
910fd145 LP |
103 | if (buffer[32] != '\n') |
104 | return -EINVAL; | |
105 | ||
4831981d | 106 | _fallthrough_; |
65548c58 LP |
107 | case 32: /* plain UUID without trailing newline */ |
108 | if (f == ID128_UUID) | |
109 | return -EINVAL; | |
110 | ||
910fd145 | 111 | buffer[32] = 0; |
65548c58 | 112 | break; |
910fd145 | 113 | |
65548c58 LP |
114 | case 37: /* RFC UUID with trailing newline */ |
115 | if (buffer[36] != '\n') | |
910fd145 LP |
116 | return -EINVAL; |
117 | ||
4831981d | 118 | _fallthrough_; |
65548c58 LP |
119 | case 36: /* RFC UUID without trailing newline */ |
120 | if (f == ID128_PLAIN) | |
910fd145 LP |
121 | return -EINVAL; |
122 | ||
123 | buffer[36] = 0; | |
65548c58 LP |
124 | break; |
125 | ||
126 | default: | |
910fd145 | 127 | return -EINVAL; |
65548c58 | 128 | } |
910fd145 LP |
129 | |
130 | return sd_id128_from_string(buffer, ret); | |
131 | } | |
132 | ||
133 | int id128_read(const char *p, Id128Format f, sd_id128_t *ret) { | |
134 | _cleanup_close_ int fd = -1; | |
135 | ||
136 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
137 | if (fd < 0) | |
138 | return -errno; | |
139 | ||
140 | return id128_read_fd(fd, f, ret); | |
141 | } | |
142 | ||
15b1248a | 143 | int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) { |
910fd145 LP |
144 | char buffer[36 + 2]; |
145 | size_t sz; | |
15b1248a | 146 | int r; |
910fd145 LP |
147 | |
148 | assert(fd >= 0); | |
149 | assert(f < _ID128_FORMAT_MAX); | |
150 | ||
151 | if (f != ID128_UUID) { | |
152 | sd_id128_to_string(id, buffer); | |
153 | buffer[32] = '\n'; | |
154 | sz = 33; | |
155 | } else { | |
156 | id128_to_uuid_string(id, buffer); | |
157 | buffer[36] = '\n'; | |
158 | sz = 37; | |
159 | } | |
160 | ||
15b1248a LP |
161 | r = loop_write(fd, buffer, sz, false); |
162 | if (r < 0) | |
163 | return r; | |
164 | ||
165 | if (do_sync) { | |
166 | if (fsync(fd) < 0) | |
167 | return -errno; | |
8ac2f74f LP |
168 | |
169 | r = fsync_directory_of_file(fd); | |
170 | if (r < 0) | |
171 | return r; | |
15b1248a LP |
172 | } |
173 | ||
8ac2f74f | 174 | return 0; |
910fd145 LP |
175 | } |
176 | ||
15b1248a | 177 | int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) { |
910fd145 LP |
178 | _cleanup_close_ int fd = -1; |
179 | ||
da2d1421 | 180 | fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444); |
910fd145 LP |
181 | if (fd < 0) |
182 | return -errno; | |
183 | ||
15b1248a | 184 | return id128_write_fd(fd, f, id, do_sync); |
910fd145 | 185 | } |
4b58153d LP |
186 | |
187 | void id128_hash_func(const void *p, struct siphash *state) { | |
188 | siphash24_compress(p, 16, state); | |
189 | } | |
190 | ||
191 | int id128_compare_func(const void *a, const void *b) { | |
192 | return memcmp(a, b, 16); | |
193 | } | |
194 | ||
195 | const struct hash_ops id128_hash_ops = { | |
196 | .hash = id128_hash_func, | |
197 | .compare = id128_compare_func, | |
198 | }; |