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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
910fd145 | 2 | |
dccca82b | 3 | #include <errno.h> |
910fd145 | 4 | #include <fcntl.h> |
15b1248a | 5 | #include <unistd.h> |
910fd145 LP |
6 | |
7 | #include "fd-util.h" | |
8ac2f74f | 8 | #include "fs-util.h" |
910fd145 LP |
9 | #include "hexdecoct.h" |
10 | #include "id128-util.h" | |
11 | #include "io-util.h" | |
12 | #include "stdio-util.h" | |
80851148 | 13 | #include "string-util.h" |
910fd145 | 14 | |
b5ea030d | 15 | char *id128_to_uuid_string(sd_id128_t id, char s[static ID128_UUID_STRING_MAX]) { |
910fd145 LP |
16 | unsigned n, k = 0; |
17 | ||
18 | assert(s); | |
19 | ||
20 | /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */ | |
21 | ||
22 | for (n = 0; n < 16; n++) { | |
23 | ||
24 | if (IN_SET(n, 4, 6, 8, 10)) | |
25 | s[k++] = '-'; | |
26 | ||
27 | s[k++] = hexchar(id.bytes[n] >> 4); | |
28 | s[k++] = hexchar(id.bytes[n] & 0xF); | |
29 | } | |
30 | ||
31 | assert(k == 36); | |
32 | ||
33 | s[k] = 0; | |
34 | ||
35 | return s; | |
36 | } | |
37 | ||
38 | bool id128_is_valid(const char *s) { | |
39 | size_t i, l; | |
40 | ||
41 | assert(s); | |
42 | ||
43 | l = strlen(s); | |
44 | if (l == 32) { | |
45 | ||
46 | /* Plain formatted 128bit hex string */ | |
47 | ||
48 | for (i = 0; i < l; i++) { | |
49 | char c = s[i]; | |
50 | ||
51 | if (!(c >= '0' && c <= '9') && | |
52 | !(c >= 'a' && c <= 'z') && | |
53 | !(c >= 'A' && c <= 'Z')) | |
54 | return false; | |
55 | } | |
56 | ||
57 | } else if (l == 36) { | |
58 | ||
59 | /* Formatted UUID */ | |
60 | ||
61 | for (i = 0; i < l; i++) { | |
62 | char c = s[i]; | |
63 | ||
945c2931 | 64 | if (IN_SET(i, 8, 13, 18, 23)) { |
910fd145 LP |
65 | if (c != '-') |
66 | return false; | |
67 | } else { | |
68 | if (!(c >= '0' && c <= '9') && | |
69 | !(c >= 'a' && c <= 'z') && | |
70 | !(c >= 'A' && c <= 'Z')) | |
71 | return false; | |
72 | } | |
73 | } | |
74 | ||
75 | } else | |
76 | return false; | |
77 | ||
78 | return true; | |
79 | } | |
80 | ||
81 | int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) { | |
82 | char buffer[36 + 2]; | |
83 | ssize_t l; | |
84 | ||
85 | assert(fd >= 0); | |
86 | assert(f < _ID128_FORMAT_MAX); | |
87 | ||
88 | /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both | |
65548c58 LP |
89 | * optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they |
90 | * aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you | |
91 | * accept". */ | |
910fd145 | 92 | |
65548c58 | 93 | l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */ |
910fd145 LP |
94 | if (l < 0) |
95 | return (int) l; | |
96 | if (l == 0) /* empty? */ | |
97 | return -ENOMEDIUM; | |
98 | ||
65548c58 | 99 | switch (l) { |
910fd145 | 100 | |
80851148 HS |
101 | case 13: |
102 | case 14: | |
103 | /* Treat an "uninitialized" id file like an empty one */ | |
104 | return f == ID128_PLAIN_OR_UNINIT && strneq(buffer, "uninitialized\n", l) ? -ENOMEDIUM : -EINVAL; | |
105 | ||
65548c58 | 106 | case 33: /* plain UUID with trailing newline */ |
910fd145 LP |
107 | if (buffer[32] != '\n') |
108 | return -EINVAL; | |
109 | ||
4831981d | 110 | _fallthrough_; |
65548c58 LP |
111 | case 32: /* plain UUID without trailing newline */ |
112 | if (f == ID128_UUID) | |
113 | return -EINVAL; | |
114 | ||
910fd145 | 115 | buffer[32] = 0; |
65548c58 | 116 | break; |
910fd145 | 117 | |
65548c58 LP |
118 | case 37: /* RFC UUID with trailing newline */ |
119 | if (buffer[36] != '\n') | |
910fd145 LP |
120 | return -EINVAL; |
121 | ||
4831981d | 122 | _fallthrough_; |
65548c58 | 123 | case 36: /* RFC UUID without trailing newline */ |
80851148 | 124 | if (IN_SET(f, ID128_PLAIN, ID128_PLAIN_OR_UNINIT)) |
910fd145 LP |
125 | return -EINVAL; |
126 | ||
127 | buffer[36] = 0; | |
65548c58 LP |
128 | break; |
129 | ||
130 | default: | |
910fd145 | 131 | return -EINVAL; |
65548c58 | 132 | } |
910fd145 LP |
133 | |
134 | return sd_id128_from_string(buffer, ret); | |
135 | } | |
136 | ||
137 | int id128_read(const char *p, Id128Format f, sd_id128_t *ret) { | |
138 | _cleanup_close_ int fd = -1; | |
139 | ||
140 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
141 | if (fd < 0) | |
142 | return -errno; | |
143 | ||
144 | return id128_read_fd(fd, f, ret); | |
145 | } | |
146 | ||
15b1248a | 147 | int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) { |
910fd145 LP |
148 | char buffer[36 + 2]; |
149 | size_t sz; | |
15b1248a | 150 | int r; |
910fd145 LP |
151 | |
152 | assert(fd >= 0); | |
153 | assert(f < _ID128_FORMAT_MAX); | |
154 | ||
155 | if (f != ID128_UUID) { | |
156 | sd_id128_to_string(id, buffer); | |
157 | buffer[32] = '\n'; | |
158 | sz = 33; | |
159 | } else { | |
160 | id128_to_uuid_string(id, buffer); | |
161 | buffer[36] = '\n'; | |
162 | sz = 37; | |
163 | } | |
164 | ||
15b1248a LP |
165 | r = loop_write(fd, buffer, sz, false); |
166 | if (r < 0) | |
167 | return r; | |
168 | ||
169 | if (do_sync) { | |
170 | if (fsync(fd) < 0) | |
171 | return -errno; | |
8ac2f74f LP |
172 | |
173 | r = fsync_directory_of_file(fd); | |
174 | if (r < 0) | |
175 | return r; | |
15b1248a LP |
176 | } |
177 | ||
8ac2f74f | 178 | return 0; |
910fd145 LP |
179 | } |
180 | ||
15b1248a | 181 | int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) { |
910fd145 LP |
182 | _cleanup_close_ int fd = -1; |
183 | ||
da2d1421 | 184 | fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444); |
910fd145 LP |
185 | if (fd < 0) |
186 | return -errno; | |
187 | ||
15b1248a | 188 | return id128_write_fd(fd, f, id, do_sync); |
910fd145 | 189 | } |
4b58153d | 190 | |
7a08d314 YW |
191 | void id128_hash_func(const sd_id128_t *p, struct siphash *state) { |
192 | siphash24_compress(p, sizeof(sd_id128_t), state); | |
4b58153d LP |
193 | } |
194 | ||
7a08d314 | 195 | int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) { |
4b58153d LP |
196 | return memcmp(a, b, 16); |
197 | } | |
198 | ||
1293a168 LP |
199 | sd_id128_t id128_make_v4_uuid(sd_id128_t id) { |
200 | /* Stolen from generate_random_uuid() of drivers/char/random.c | |
201 | * in the kernel sources */ | |
202 | ||
203 | /* Set UUID version to 4 --- truly random generation */ | |
204 | id.bytes[6] = (id.bytes[6] & 0x0F) | 0x40; | |
205 | ||
206 | /* Set the UUID variant to DCE */ | |
207 | id.bytes[8] = (id.bytes[8] & 0x3F) | 0x80; | |
208 | ||
209 | return id; | |
210 | } | |
211 | ||
7a08d314 | 212 | DEFINE_HASH_OPS(id128_hash_ops, sd_id128_t, id128_hash_func, id128_compare_func); |
b4be4ff8 LP |
213 | |
214 | int id128_get_product(sd_id128_t *ret) { | |
215 | sd_id128_t uuid; | |
216 | int r; | |
217 | ||
218 | assert(ret); | |
219 | ||
220 | /* Reads the systems product UUID from DMI or devicetree (where it is located on POWER). This is | |
221 | * particularly relevant in VM environments, where VM managers typically place a VM uuid there. */ | |
222 | ||
223 | r = id128_read("/sys/class/dmi/id/product_uuid", ID128_UUID, &uuid); | |
224 | if (r == -ENOENT) | |
225 | r = id128_read("/sys/firmware/devicetree/base/vm,uuid", ID128_UUID, &uuid); | |
226 | if (r < 0) | |
227 | return r; | |
228 | ||
229 | if (sd_id128_is_null(uuid) || sd_id128_is_allf(uuid)) | |
230 | return -EADDRNOTAVAIL; /* Recognizable error */ | |
231 | ||
232 | *ret = uuid; | |
233 | return 0; | |
234 | } |