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88a6477e KS |
1 | /*** |
2 | This file is part of systemd. | |
3 | ||
4 | Copyright 2008-2012 Kay Sievers <kay@vrfy.org> | |
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 | ***/ | |
eb1f0e66 | 19 | |
eb1f0e66 KS |
20 | #include <stdio.h> |
21 | #include <stdlib.h> | |
22 | #include <stddef.h> | |
23 | #include <unistd.h> | |
24 | #include <errno.h> | |
25 | #include <string.h> | |
26 | #include <dirent.h> | |
75250977 | 27 | #include <ctype.h> |
93b0f384 | 28 | #include <fcntl.h> |
9c6a11b1 | 29 | #include <time.h> |
9e13dbae KS |
30 | #include <pwd.h> |
31 | #include <grp.h> | |
eb1f0e66 | 32 | #include <sys/stat.h> |
9e13dbae | 33 | #include <sys/param.h> |
eb1f0e66 | 34 | |
8f6ce71f | 35 | #include "device-nodes.h" |
eb1f0e66 KS |
36 | #include "libudev.h" |
37 | #include "libudev-private.h" | |
02a36bc9 | 38 | #include "utf8.h" |
57d0e6b2 | 39 | #include "MurmurHash2.h" |
eb1f0e66 | 40 | |
0bbe8838 KS |
41 | /** |
42 | * SECTION:libudev-util | |
43 | * @short_description: utils | |
21dbe43a KS |
44 | * |
45 | * Utilities useful when dealing with devices and device node names. | |
0bbe8838 KS |
46 | */ |
47 | ||
9e13dbae KS |
48 | /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */ |
49 | int util_resolve_subsys_kernel(struct udev *udev, const char *string, | |
50 | char *result, size_t maxsize, int read_value) | |
51 | { | |
52 | char temp[UTIL_PATH_SIZE]; | |
53 | char *subsys; | |
54 | char *sysname; | |
55 | struct udev_device *dev; | |
56 | char *attr; | |
57 | ||
58 | if (string[0] != '[') | |
59 | return -1; | |
60 | ||
d5a89d7d | 61 | strscpy(temp, sizeof(temp), string); |
9e13dbae KS |
62 | |
63 | subsys = &temp[1]; | |
64 | ||
65 | sysname = strchr(subsys, '/'); | |
66 | if (sysname == NULL) | |
67 | return -1; | |
68 | sysname[0] = '\0'; | |
69 | sysname = &sysname[1]; | |
70 | ||
71 | attr = strchr(sysname, ']'); | |
72 | if (attr == NULL) | |
73 | return -1; | |
74 | attr[0] = '\0'; | |
75 | attr = &attr[1]; | |
76 | if (attr[0] == '/') | |
77 | attr = &attr[1]; | |
78 | if (attr[0] == '\0') | |
79 | attr = NULL; | |
80 | ||
81 | if (read_value && attr == NULL) | |
82 | return -1; | |
83 | ||
84 | dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname); | |
85 | if (dev == NULL) | |
86 | return -1; | |
87 | ||
88 | if (read_value) { | |
89 | const char *val; | |
90 | ||
91 | val = udev_device_get_sysattr_value(dev, attr); | |
92 | if (val != NULL) | |
d5a89d7d | 93 | strscpy(result, maxsize, val); |
9e13dbae KS |
94 | else |
95 | result[0] = '\0'; | |
c8f8394a | 96 | udev_dbg(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result); |
9e13dbae KS |
97 | } else { |
98 | size_t l; | |
99 | char *s; | |
100 | ||
101 | s = result; | |
d5a89d7d | 102 | l = strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL); |
9e13dbae | 103 | if (attr != NULL) |
d5a89d7d | 104 | strpcpyl(&s, l, "/", attr, NULL); |
c8f8394a | 105 | udev_dbg(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result); |
9e13dbae KS |
106 | } |
107 | udev_device_unref(dev); | |
108 | return 0; | |
109 | } | |
955d98c9 | 110 | |
cdfdc85f | 111 | ssize_t util_get_sys_core_link_value(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size) |
eb1f0e66 | 112 | { |
912541b0 KS |
113 | char path[UTIL_PATH_SIZE]; |
114 | char target[UTIL_PATH_SIZE]; | |
115 | ssize_t len; | |
116 | const char *pos; | |
117 | ||
d5a89d7d | 118 | strscpyl(path, sizeof(path), syspath, "/", slink, NULL); |
912541b0 KS |
119 | len = readlink(path, target, sizeof(target)); |
120 | if (len <= 0 || len == (ssize_t)sizeof(target)) | |
121 | return -1; | |
122 | target[len] = '\0'; | |
123 | pos = strrchr(target, '/'); | |
124 | if (pos == NULL) | |
125 | return -1; | |
126 | pos = &pos[1]; | |
d5a89d7d | 127 | return strscpy(value, size, pos); |
eb1f0e66 | 128 | } |
95d90c4f | 129 | |
8753fadf | 130 | int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size) |
b21b95d7 | 131 | { |
912541b0 KS |
132 | char link_target[UTIL_PATH_SIZE]; |
133 | ||
134 | ssize_t len; | |
135 | int i; | |
136 | int back; | |
bd59d823 | 137 | char *base = NULL; |
912541b0 KS |
138 | |
139 | len = readlink(syspath, link_target, sizeof(link_target)); | |
140 | if (len <= 0 || len == (ssize_t)sizeof(link_target)) | |
141 | return -1; | |
142 | link_target[len] = '\0'; | |
912541b0 | 143 | |
33502ffe | 144 | for (back = 0; startswith(&link_target[back * 3], "../"); back++) |
912541b0 | 145 | ; |
912541b0 KS |
146 | for (i = 0; i <= back; i++) { |
147 | base = strrchr(syspath, '/'); | |
148 | if (base == NULL) | |
bd59d823 | 149 | return -EINVAL; |
912541b0 KS |
150 | base[0] = '\0'; |
151 | } | |
4dd1de72 | 152 | |
d5a89d7d | 153 | strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL); |
912541b0 | 154 | return 0; |
b21b95d7 | 155 | } |
7a01f11a | 156 | |
7a01f11a KS |
157 | int util_log_priority(const char *priority) |
158 | { | |
912541b0 KS |
159 | char *endptr; |
160 | int prio; | |
161 | ||
162 | prio = strtol(priority, &endptr, 10); | |
163 | if (endptr[0] == '\0' || isspace(endptr[0])) | |
164 | return prio; | |
ba7408a6 TG |
165 | |
166 | return log_level_from_string(priority); | |
7a01f11a KS |
167 | } |
168 | ||
065db052 | 169 | size_t util_path_encode(const char *src, char *dest, size_t size) |
7a01f11a | 170 | { |
912541b0 KS |
171 | size_t i, j; |
172 | ||
173 | for (i = 0, j = 0; src[i] != '\0'; i++) { | |
174 | if (src[i] == '/') { | |
175 | if (j+4 >= size) { | |
176 | j = 0; | |
177 | break; | |
178 | } | |
179 | memcpy(&dest[j], "\\x2f", 4); | |
180 | j += 4; | |
181 | } else if (src[i] == '\\') { | |
182 | if (j+4 >= size) { | |
183 | j = 0; | |
184 | break; | |
185 | } | |
186 | memcpy(&dest[j], "\\x5c", 4); | |
187 | j += 4; | |
188 | } else { | |
189 | if (j+1 >= size) { | |
190 | j = 0; | |
191 | break; | |
192 | } | |
193 | dest[j] = src[i]; | |
194 | j++; | |
195 | } | |
196 | } | |
197 | dest[j] = '\0'; | |
198 | return j; | |
7a01f11a KS |
199 | } |
200 | ||
7a01f11a KS |
201 | void util_remove_trailing_chars(char *path, char c) |
202 | { | |
912541b0 | 203 | size_t len; |
7a01f11a | 204 | |
912541b0 KS |
205 | if (path == NULL) |
206 | return; | |
207 | len = strlen(path); | |
208 | while (len > 0 && path[len-1] == c) | |
209 | path[--len] = '\0'; | |
7a01f11a | 210 | } |
3eb46ec6 | 211 | |
0bbe8838 | 212 | int util_replace_whitespace(const char *str, char *to, size_t len) |
92f43136 | 213 | { |
912541b0 KS |
214 | size_t i, j; |
215 | ||
216 | /* strip trailing whitespace */ | |
217 | len = strnlen(str, len); | |
218 | while (len && isspace(str[len-1])) | |
219 | len--; | |
220 | ||
221 | /* strip leading whitespace */ | |
222 | i = 0; | |
223 | while (isspace(str[i]) && (i < len)) | |
224 | i++; | |
225 | ||
226 | j = 0; | |
227 | while (i < len) { | |
228 | /* substitute multiple whitespace with a single '_' */ | |
229 | if (isspace(str[i])) { | |
230 | while (isspace(str[i])) | |
231 | i++; | |
232 | to[j++] = '_'; | |
233 | } | |
234 | to[j++] = str[i++]; | |
235 | } | |
236 | to[j] = '\0'; | |
237 | return 0; | |
92f43136 KS |
238 | } |
239 | ||
75250977 | 240 | /* allow chars in whitelist, plain ascii, hex-escaping and valid utf8 */ |
0bbe8838 | 241 | int util_replace_chars(char *str, const char *white) |
75250977 | 242 | { |
912541b0 KS |
243 | size_t i = 0; |
244 | int replaced = 0; | |
245 | ||
246 | while (str[i] != '\0') { | |
247 | int len; | |
248 | ||
8f6ce71f | 249 | if (whitelisted_char_for_devnode(str[i], white)) { |
912541b0 KS |
250 | i++; |
251 | continue; | |
252 | } | |
253 | ||
254 | /* accept hex encoding */ | |
255 | if (str[i] == '\\' && str[i+1] == 'x') { | |
256 | i += 2; | |
257 | continue; | |
258 | } | |
259 | ||
260 | /* accept valid utf8 */ | |
261 | len = utf8_encoded_valid_unichar(&str[i]); | |
262 | if (len > 1) { | |
263 | i += len; | |
264 | continue; | |
265 | } | |
266 | ||
267 | /* if space is allowed, replace whitespace with ordinary space */ | |
268 | if (isspace(str[i]) && white != NULL && strchr(white, ' ') != NULL) { | |
269 | str[i] = ' '; | |
270 | i++; | |
271 | replaced++; | |
272 | continue; | |
273 | } | |
274 | ||
275 | /* everything else is replaced with '_' */ | |
276 | str[i] = '_'; | |
277 | i++; | |
278 | replaced++; | |
279 | } | |
280 | return replaced; | |
75250977 | 281 | } |
92f43136 KS |
282 | |
283 | /** | |
0bbe8838 | 284 | * udev_util_encode_string: |
92f43136 KS |
285 | * @str: input string to be encoded |
286 | * @str_enc: output string to store the encoded input string | |
287 | * @len: maximum size of the output string, which may be | |
288 | * four times as long as the input string | |
289 | * | |
290 | * Encode all potentially unsafe characters of a string to the | |
0bbe8838 | 291 | * corresponding 2 char hex value prefixed by '\x'. |
92f43136 KS |
292 | * |
293 | * Returns: 0 if the entire string was copied, non-zero otherwise. | |
294 | **/ | |
54cf0b7f | 295 | _public_ int udev_util_encode_string(const char *str, char *str_enc, size_t len) |
92f43136 | 296 | { |
8f6ce71f | 297 | return encode_devnode_name(str, str_enc, len); |
92f43136 | 298 | } |
4b09a2fc | 299 | |
c7dff03e | 300 | unsigned int util_string_hash32(const char *str) |
e14bdd88 | 301 | { |
57d0e6b2 | 302 | return MurmurHash2(str, strlen(str), 0); |
28460195 | 303 | } |
c7dff03e | 304 | |
28460195 KS |
305 | /* get a bunch of bit numbers out of the hash, and set the bits in our bit field */ |
306 | uint64_t util_string_bloom64(const char *str) | |
307 | { | |
912541b0 KS |
308 | uint64_t bits = 0; |
309 | unsigned int hash = util_string_hash32(str); | |
310 | ||
311 | bits |= 1LLU << (hash & 63); | |
312 | bits |= 1LLU << ((hash >> 6) & 63); | |
313 | bits |= 1LLU << ((hash >> 12) & 63); | |
314 | bits |= 1LLU << ((hash >> 18) & 63); | |
315 | return bits; | |
e14bdd88 | 316 | } |