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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
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" | |
13 | ||
14 | char *id128_to_uuid_string(sd_id128_t id, char s[37]) { | |
15 | unsigned n, k = 0; | |
16 | ||
17 | assert(s); | |
18 | ||
19 | /* Similar to sd_id128_to_string() but formats the result as UUID instead of plain hex chars */ | |
20 | ||
21 | for (n = 0; n < 16; n++) { | |
22 | ||
23 | if (IN_SET(n, 4, 6, 8, 10)) | |
24 | s[k++] = '-'; | |
25 | ||
26 | s[k++] = hexchar(id.bytes[n] >> 4); | |
27 | s[k++] = hexchar(id.bytes[n] & 0xF); | |
28 | } | |
29 | ||
30 | assert(k == 36); | |
31 | ||
32 | s[k] = 0; | |
33 | ||
34 | return s; | |
35 | } | |
36 | ||
37 | bool id128_is_valid(const char *s) { | |
38 | size_t i, l; | |
39 | ||
40 | assert(s); | |
41 | ||
42 | l = strlen(s); | |
43 | if (l == 32) { | |
44 | ||
45 | /* Plain formatted 128bit hex string */ | |
46 | ||
47 | for (i = 0; i < l; i++) { | |
48 | char c = s[i]; | |
49 | ||
50 | if (!(c >= '0' && c <= '9') && | |
51 | !(c >= 'a' && c <= 'z') && | |
52 | !(c >= 'A' && c <= 'Z')) | |
53 | return false; | |
54 | } | |
55 | ||
56 | } else if (l == 36) { | |
57 | ||
58 | /* Formatted UUID */ | |
59 | ||
60 | for (i = 0; i < l; i++) { | |
61 | char c = s[i]; | |
62 | ||
945c2931 | 63 | if (IN_SET(i, 8, 13, 18, 23)) { |
910fd145 LP |
64 | if (c != '-') |
65 | return false; | |
66 | } else { | |
67 | if (!(c >= '0' && c <= '9') && | |
68 | !(c >= 'a' && c <= 'z') && | |
69 | !(c >= 'A' && c <= 'Z')) | |
70 | return false; | |
71 | } | |
72 | } | |
73 | ||
74 | } else | |
75 | return false; | |
76 | ||
77 | return true; | |
78 | } | |
79 | ||
80 | int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) { | |
81 | char buffer[36 + 2]; | |
82 | ssize_t l; | |
83 | ||
84 | assert(fd >= 0); | |
85 | assert(f < _ID128_FORMAT_MAX); | |
86 | ||
87 | /* Reads an 128bit ID from a file, which may either be in plain format (32 hex digits), or in UUID format, both | |
65548c58 LP |
88 | * optionally followed by a newline and nothing else. ID files should really be newline terminated, but if they |
89 | * aren't that's OK too, following the rule of "Be conservative in what you send, be liberal in what you | |
90 | * accept". */ | |
910fd145 | 91 | |
65548c58 | 92 | l = loop_read(fd, buffer, sizeof(buffer), false); /* we expect a short read of either 32/33 or 36/37 chars */ |
910fd145 LP |
93 | if (l < 0) |
94 | return (int) l; | |
95 | if (l == 0) /* empty? */ | |
96 | return -ENOMEDIUM; | |
97 | ||
65548c58 | 98 | switch (l) { |
910fd145 | 99 | |
65548c58 | 100 | case 33: /* plain UUID with trailing newline */ |
910fd145 LP |
101 | if (buffer[32] != '\n') |
102 | return -EINVAL; | |
103 | ||
4831981d | 104 | _fallthrough_; |
65548c58 LP |
105 | case 32: /* plain UUID without trailing newline */ |
106 | if (f == ID128_UUID) | |
107 | return -EINVAL; | |
108 | ||
910fd145 | 109 | buffer[32] = 0; |
65548c58 | 110 | break; |
910fd145 | 111 | |
65548c58 LP |
112 | case 37: /* RFC UUID with trailing newline */ |
113 | if (buffer[36] != '\n') | |
910fd145 LP |
114 | return -EINVAL; |
115 | ||
4831981d | 116 | _fallthrough_; |
65548c58 LP |
117 | case 36: /* RFC UUID without trailing newline */ |
118 | if (f == ID128_PLAIN) | |
910fd145 LP |
119 | return -EINVAL; |
120 | ||
121 | buffer[36] = 0; | |
65548c58 LP |
122 | break; |
123 | ||
124 | default: | |
910fd145 | 125 | return -EINVAL; |
65548c58 | 126 | } |
910fd145 LP |
127 | |
128 | return sd_id128_from_string(buffer, ret); | |
129 | } | |
130 | ||
131 | int id128_read(const char *p, Id128Format f, sd_id128_t *ret) { | |
132 | _cleanup_close_ int fd = -1; | |
133 | ||
134 | fd = open(p, O_RDONLY|O_CLOEXEC|O_NOCTTY); | |
135 | if (fd < 0) | |
136 | return -errno; | |
137 | ||
138 | return id128_read_fd(fd, f, ret); | |
139 | } | |
140 | ||
15b1248a | 141 | int id128_write_fd(int fd, Id128Format f, sd_id128_t id, bool do_sync) { |
910fd145 LP |
142 | char buffer[36 + 2]; |
143 | size_t sz; | |
15b1248a | 144 | int r; |
910fd145 LP |
145 | |
146 | assert(fd >= 0); | |
147 | assert(f < _ID128_FORMAT_MAX); | |
148 | ||
149 | if (f != ID128_UUID) { | |
150 | sd_id128_to_string(id, buffer); | |
151 | buffer[32] = '\n'; | |
152 | sz = 33; | |
153 | } else { | |
154 | id128_to_uuid_string(id, buffer); | |
155 | buffer[36] = '\n'; | |
156 | sz = 37; | |
157 | } | |
158 | ||
15b1248a LP |
159 | r = loop_write(fd, buffer, sz, false); |
160 | if (r < 0) | |
161 | return r; | |
162 | ||
163 | if (do_sync) { | |
164 | if (fsync(fd) < 0) | |
165 | return -errno; | |
8ac2f74f LP |
166 | |
167 | r = fsync_directory_of_file(fd); | |
168 | if (r < 0) | |
169 | return r; | |
15b1248a LP |
170 | } |
171 | ||
8ac2f74f | 172 | return 0; |
910fd145 LP |
173 | } |
174 | ||
15b1248a | 175 | int id128_write(const char *p, Id128Format f, sd_id128_t id, bool do_sync) { |
910fd145 LP |
176 | _cleanup_close_ int fd = -1; |
177 | ||
da2d1421 | 178 | fd = open(p, O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY|O_TRUNC, 0444); |
910fd145 LP |
179 | if (fd < 0) |
180 | return -errno; | |
181 | ||
15b1248a | 182 | return id128_write_fd(fd, f, id, do_sync); |
910fd145 | 183 | } |
4b58153d | 184 | |
7a08d314 YW |
185 | void id128_hash_func(const sd_id128_t *p, struct siphash *state) { |
186 | siphash24_compress(p, sizeof(sd_id128_t), state); | |
4b58153d LP |
187 | } |
188 | ||
7a08d314 | 189 | int id128_compare_func(const sd_id128_t *a, const sd_id128_t *b) { |
4b58153d LP |
190 | return memcmp(a, b, 16); |
191 | } | |
192 | ||
7a08d314 | 193 | DEFINE_HASH_OPS(id128_hash_ops, sd_id128_t, id128_hash_func, id128_compare_func); |