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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
57fa1d09 TG |
2 | |
3 | #include <ctype.h> | |
57fa1d09 | 4 | #include <net/if.h> |
ef118d00 | 5 | #include <sys/ioctl.h> |
07630cea | 6 | #include <sys/types.h> |
57fa1d09 | 7 | |
07630cea LP |
8 | #include "sd-device.h" |
9 | ||
b5efdb8a | 10 | #include "alloc-util.h" |
f461a28d | 11 | #include "chase.h" |
07630cea LP |
12 | #include "device-internal.h" |
13 | #include "device-private.h" | |
14 | #include "device-util.h" | |
7176f06c | 15 | #include "devnum-util.h" |
8fb3f009 | 16 | #include "dirent-util.h" |
a7910612 | 17 | #include "env-util.h" |
3ffd4af2 | 18 | #include "fd-util.h" |
57fa1d09 | 19 | #include "fileio.h" |
bd44a727 | 20 | #include "format-util.h" |
f4f15635 | 21 | #include "fs-util.h" |
57fa1d09 | 22 | #include "hashmap.h" |
b485fd93 | 23 | #include "id128-util.h" |
07630cea | 24 | #include "macro.h" |
a7910612 | 25 | #include "missing_magic.h" |
bd44a727 | 26 | #include "netlink-util.h" |
6bedfcbb | 27 | #include "parse-util.h" |
07630cea | 28 | #include "path-util.h" |
57fa1d09 | 29 | #include "set.h" |
429b4350 | 30 | #include "socket-util.h" |
dc5042c0 | 31 | #include "stdio-util.h" |
07630cea | 32 | #include "string-util.h" |
57fa1d09 | 33 | #include "strv.h" |
07630cea | 34 | #include "strxcpyx.h" |
f5fbe71d | 35 | #include "user-util.h" |
57fa1d09 TG |
36 | |
37 | int device_new_aux(sd_device **ret) { | |
2cfb1978 | 38 | sd_device *device; |
57fa1d09 TG |
39 | |
40 | assert(ret); | |
41 | ||
6116d2b2 | 42 | device = new(sd_device, 1); |
57fa1d09 TG |
43 | if (!device) |
44 | return -ENOMEM; | |
45 | ||
6116d2b2 YW |
46 | *device = (sd_device) { |
47 | .n_ref = 1, | |
f5fbe71d YW |
48 | .devmode = MODE_INVALID, |
49 | .devuid = UID_INVALID, | |
50 | .devgid = GID_INVALID, | |
a1130022 | 51 | .action = _SD_DEVICE_ACTION_INVALID, |
6116d2b2 | 52 | }; |
57fa1d09 TG |
53 | |
54 | *ret = device; | |
57fa1d09 TG |
55 | return 0; |
56 | } | |
57 | ||
8301aa0b YW |
58 | static sd_device *device_free(sd_device *device) { |
59 | assert(device); | |
57fa1d09 | 60 | |
8301aa0b YW |
61 | sd_device_unref(device->parent); |
62 | free(device->syspath); | |
63 | free(device->sysname); | |
64 | free(device->devtype); | |
65 | free(device->devname); | |
66 | free(device->subsystem); | |
67 | free(device->driver_subsystem); | |
68 | free(device->driver); | |
fe732381 | 69 | free(device->device_id); |
8301aa0b YW |
70 | free(device->properties_strv); |
71 | free(device->properties_nulstr); | |
72 | ||
dd75bbee YW |
73 | ordered_hashmap_free(device->properties); |
74 | ordered_hashmap_free(device->properties_db); | |
61c0972d | 75 | hashmap_free(device->sysattr_values); |
be327321 | 76 | set_free(device->sysattrs); |
e77b146f LP |
77 | set_free(device->all_tags); |
78 | set_free(device->current_tags); | |
be327321 | 79 | set_free(device->devlinks); |
ec9b4f2b | 80 | hashmap_free(device->children); |
8301aa0b YW |
81 | |
82 | return mfree(device); | |
57fa1d09 TG |
83 | } |
84 | ||
8301aa0b | 85 | DEFINE_PUBLIC_TRIVIAL_REF_UNREF_FUNC(sd_device, sd_device, device_free); |
57fa1d09 | 86 | |
4f1ef7f9 | 87 | int device_add_property_aux(sd_device *device, const char *key, const char *value, bool db) { |
57fa1d09 TG |
88 | OrderedHashmap **properties; |
89 | ||
90 | assert(device); | |
4f1ef7f9 | 91 | assert(key); |
57fa1d09 TG |
92 | |
93 | if (db) | |
94 | properties = &device->properties_db; | |
95 | else | |
96 | properties = &device->properties; | |
97 | ||
4f1ef7f9 | 98 | if (value) { |
d7ac0952 FS |
99 | _unused_ _cleanup_free_ char *old_value = NULL; |
100 | _cleanup_free_ char *new_key = NULL, *new_value = NULL, *old_key = NULL; | |
57fa1d09 TG |
101 | int r; |
102 | ||
dd75bbee | 103 | r = ordered_hashmap_ensure_allocated(properties, &string_hash_ops_free_free); |
57fa1d09 TG |
104 | if (r < 0) |
105 | return r; | |
106 | ||
4f1ef7f9 YW |
107 | new_key = strdup(key); |
108 | if (!new_key) | |
57fa1d09 TG |
109 | return -ENOMEM; |
110 | ||
4f1ef7f9 YW |
111 | new_value = strdup(value); |
112 | if (!new_value) | |
57fa1d09 TG |
113 | return -ENOMEM; |
114 | ||
115 | old_value = ordered_hashmap_get2(*properties, key, (void**) &old_key); | |
116 | ||
327379f5 | 117 | /* ordered_hashmap_replace() does not fail when the hashmap already has the entry. */ |
4f1ef7f9 | 118 | r = ordered_hashmap_replace(*properties, new_key, new_value); |
57fa1d09 TG |
119 | if (r < 0) |
120 | return r; | |
121 | ||
4f1ef7f9 YW |
122 | TAKE_PTR(new_key); |
123 | TAKE_PTR(new_value); | |
57fa1d09 | 124 | } else { |
d7ac0952 FS |
125 | _unused_ _cleanup_free_ char *old_value = NULL; |
126 | _cleanup_free_ char *old_key = NULL; | |
57fa1d09 | 127 | |
4f1ef7f9 | 128 | old_value = ordered_hashmap_remove2(*properties, key, (void**) &old_key); |
57fa1d09 TG |
129 | } |
130 | ||
131 | if (!db) { | |
313cefa1 | 132 | device->properties_generation++; |
57fa1d09 TG |
133 | device->properties_buf_outdated = true; |
134 | } | |
135 | ||
136 | return 0; | |
137 | } | |
138 | ||
57fa1d09 TG |
139 | int device_set_syspath(sd_device *device, const char *_syspath, bool verify) { |
140 | _cleanup_free_ char *syspath = NULL; | |
141 | const char *devpath; | |
142 | int r; | |
143 | ||
144 | assert(device); | |
145 | assert(_syspath); | |
146 | ||
57fa1d09 | 147 | if (verify) { |
254d1313 | 148 | _cleanup_close_ int fd = -EBADF; |
1793bb61 | 149 | |
95c250be YW |
150 | /* The input path maybe a symlink located outside of /sys. Let's try to chase the symlink at first. |
151 | * The primary usecase is that e.g. /proc/device-tree is a symlink to /sys/firmware/devicetree/base. | |
152 | * By chasing symlinks in the path at first, we can call sd_device_new_from_path() with such path. */ | |
f461a28d | 153 | r = chase(_syspath, NULL, 0, &syspath, &fd); |
08232a02 | 154 | if (r == -ENOENT) |
d7cb60da YW |
155 | /* the device does not exist (any more?) */ |
156 | return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), | |
157 | "sd-device: Failed to chase symlinks in \"%s\".", _syspath); | |
d89e0dc8 | 158 | if (r < 0) |
c7d54dae | 159 | return log_debug_errno(r, "sd-device: Failed to get target of '%s': %m", _syspath); |
57fa1d09 | 160 | |
2e1ec12e YW |
161 | if (!path_startswith(syspath, "/sys")) { |
162 | _cleanup_free_ char *real_sys = NULL, *new_syspath = NULL; | |
163 | char *p; | |
164 | ||
165 | /* /sys is a symlink to somewhere sysfs is mounted on? In that case, we convert the path to real sysfs to "/sys". */ | |
f461a28d | 166 | r = chase("/sys", NULL, 0, &real_sys, NULL); |
2e1ec12e | 167 | if (r < 0) |
c7d54dae | 168 | return log_debug_errno(r, "sd-device: Failed to chase symlink /sys: %m"); |
2e1ec12e YW |
169 | |
170 | p = path_startswith(syspath, real_sys); | |
baaa35ad ZJS |
171 | if (!p) |
172 | return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), | |
173 | "sd-device: Canonicalized path '%s' does not starts with sysfs mount point '%s'", | |
174 | syspath, real_sys); | |
2e1ec12e | 175 | |
657ee2d8 | 176 | new_syspath = path_join("/sys", p); |
2e1ec12e | 177 | if (!new_syspath) |
d7cb60da | 178 | return log_oom_debug(); |
2e1ec12e YW |
179 | |
180 | free_and_replace(syspath, new_syspath); | |
4ff361cc | 181 | path_simplify(syspath); |
2e1ec12e YW |
182 | } |
183 | ||
1793bb61 LP |
184 | if (path_startswith(syspath, "/sys/devices/")) { |
185 | /* For proper devices, stricter rules apply: they must have a 'uevent' file, | |
186 | * otherwise we won't allow them */ | |
57fa1d09 | 187 | |
1793bb61 | 188 | if (faccessat(fd, "uevent", F_OK, 0) < 0) { |
52d62901 | 189 | if (errno == ENOENT) |
1793bb61 LP |
190 | /* This is not a valid device. Note, this condition is quite often |
191 | * satisfied when enumerating devices or finding a parent device. | |
29fafedd YW |
192 | * Hence, use log_trace_errno() here. */ |
193 | return log_trace_errno(SYNTHETIC_ERRNO(ENODEV), | |
1793bb61 | 194 | "sd-device: the uevent file \"%s/uevent\" does not exist.", syspath); |
5cf0ee31 LP |
195 | if (errno == ENOTDIR) |
196 | /* Not actually a directory. */ | |
197 | return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), | |
198 | "sd-device: the syspath \"%s\" is not a directory.", syspath); | |
52d62901 | 199 | |
1793bb61 | 200 | return log_debug_errno(errno, "sd-device: cannot find uevent file for %s: %m", syspath); |
57fa1d09 TG |
201 | } |
202 | } else { | |
1793bb61 LP |
203 | struct stat st; |
204 | ||
205 | /* For everything else lax rules apply: they just need to be a directory */ | |
206 | ||
207 | if (fstat(fd, &st) < 0) | |
208 | return log_debug_errno(errno, "sd-device: failed to check if syspath \"%s\" is a directory: %m", syspath); | |
209 | if (!S_ISDIR(st.st_mode)) | |
d7cb60da YW |
210 | return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), |
211 | "sd-device: the syspath \"%s\" is not a directory.", syspath); | |
57fa1d09 | 212 | } |
a7910612 LP |
213 | |
214 | /* Only operate on sysfs, i.e. refuse going down into /sys/fs/cgroup/ or similar places where | |
215 | * things are not arranged as kobjects in kernel, and hence don't necessarily have | |
216 | * kobject/attribute structure. */ | |
217 | r = getenv_bool_secure("SYSTEMD_DEVICE_VERIFY_SYSFS"); | |
218 | if (r < 0 && r != -ENXIO) | |
219 | log_debug_errno(r, "Failed to parse $SYSTEMD_DEVICE_VERIFY_SYSFS value: %m"); | |
220 | if (r != 0) { | |
221 | r = fd_is_fs_type(fd, SYSFS_MAGIC); | |
222 | if (r < 0) | |
223 | return log_debug_errno(r, "sd-device: failed to check if syspath \"%s\" is backed by sysfs.", syspath); | |
224 | if (r == 0) | |
225 | return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), | |
226 | "sd-device: the syspath \"%s\" is outside of sysfs, refusing.", syspath); | |
227 | } | |
57fa1d09 | 228 | } else { |
95c250be YW |
229 | /* must be a subdirectory of /sys */ |
230 | if (!path_startswith(_syspath, "/sys/")) | |
231 | return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), | |
232 | "sd-device: Syspath '%s' is not a subdirectory of /sys", | |
233 | _syspath); | |
234 | ||
57fa1d09 TG |
235 | syspath = strdup(_syspath); |
236 | if (!syspath) | |
d7cb60da | 237 | return log_oom_debug(); |
57fa1d09 | 238 | |
4d960d0b LP |
239 | path_simplify(syspath); |
240 | } | |
57fa1d09 | 241 | |
4d960d0b | 242 | assert_se(devpath = startswith(syspath, "/sys")); |
9dcde103 | 243 | if (devpath[0] != '/') |
d7cb60da | 244 | return log_debug_errno(SYNTHETIC_ERRNO(ENODEV), "sd-device: \"/sys\" alone is not a valid device path."); |
c4f885e7 | 245 | |
57fa1d09 TG |
246 | r = device_add_property_internal(device, "DEVPATH", devpath); |
247 | if (r < 0) | |
d7cb60da | 248 | return log_debug_errno(r, "sd-device: Failed to add \"DEVPATH\" property for device \"%s\": %m", syspath); |
57fa1d09 | 249 | |
f9ecfd3b | 250 | free_and_replace(device->syspath, syspath); |
57fa1d09 | 251 | device->devpath = devpath; |
9a26098e YW |
252 | |
253 | /* Unset sysname and sysnum, they will be assigned when requested. */ | |
254 | device->sysnum = NULL; | |
255 | device->sysname = mfree(device->sysname); | |
57fa1d09 TG |
256 | return 0; |
257 | } | |
258 | ||
95c250be | 259 | static int device_new_from_syspath(sd_device **ret, const char *syspath, bool strict) { |
4afd3348 | 260 | _cleanup_(sd_device_unrefp) sd_device *device = NULL; |
57fa1d09 TG |
261 | int r; |
262 | ||
263 | assert_return(ret, -EINVAL); | |
264 | assert_return(syspath, -EINVAL); | |
265 | ||
95c250be YW |
266 | if (strict && !path_startswith(syspath, "/sys/")) |
267 | return -EINVAL; | |
268 | ||
57fa1d09 TG |
269 | r = device_new_aux(&device); |
270 | if (r < 0) | |
271 | return r; | |
272 | ||
be247835 | 273 | r = device_set_syspath(device, syspath, /* verify= */ true); |
57fa1d09 TG |
274 | if (r < 0) |
275 | return r; | |
276 | ||
1cc6c93a | 277 | *ret = TAKE_PTR(device); |
57fa1d09 TG |
278 | return 0; |
279 | } | |
280 | ||
95c250be YW |
281 | _public_ int sd_device_new_from_syspath(sd_device **ret, const char *syspath) { |
282 | return device_new_from_syspath(ret, syspath, /* strict = */ true); | |
283 | } | |
284 | ||
f79fdea6 | 285 | int device_new_from_mode_and_devnum(sd_device **ret, mode_t mode, dev_t devnum) { |
a46f9cd0 YW |
286 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
287 | _cleanup_free_ char *syspath = NULL; | |
23d3dfc3 | 288 | const char *t, *subsystem = NULL; |
a46f9cd0 YW |
289 | dev_t n; |
290 | int r; | |
57fa1d09 | 291 | |
a46f9cd0 YW |
292 | assert(ret); |
293 | ||
294 | if (S_ISCHR(mode)) | |
295 | t = "char"; | |
296 | else if (S_ISBLK(mode)) | |
297 | t = "block"; | |
298 | else | |
299 | return -ENOTTY; | |
300 | ||
301 | if (major(devnum) == 0) | |
302 | return -ENODEV; | |
303 | ||
67458536 | 304 | if (asprintf(&syspath, "/sys/dev/%s/" DEVNUM_FORMAT_STR, t, DEVNUM_FORMAT_VAL(devnum)) < 0) |
a46f9cd0 | 305 | return -ENOMEM; |
57fa1d09 | 306 | |
a46f9cd0 YW |
307 | r = sd_device_new_from_syspath(&dev, syspath); |
308 | if (r < 0) | |
309 | return r; | |
f1ad2c92 | 310 | |
a46f9cd0 YW |
311 | r = sd_device_get_devnum(dev, &n); |
312 | if (r == -ENOENT) | |
313 | return -ENXIO; | |
314 | if (r < 0) | |
315 | return r; | |
316 | if (n != devnum) | |
317 | return -ENXIO; | |
57fa1d09 | 318 | |
a46f9cd0 YW |
319 | r = sd_device_get_subsystem(dev, &subsystem); |
320 | if (r < 0 && r != -ENOENT) | |
321 | return r; | |
23d3dfc3 | 322 | if (streq_ptr(subsystem, "block") != !!S_ISBLK(mode)) |
a46f9cd0 | 323 | return -ENXIO; |
57fa1d09 | 324 | |
a46f9cd0 YW |
325 | *ret = TAKE_PTR(dev); |
326 | return 0; | |
327 | } | |
328 | ||
329 | _public_ int sd_device_new_from_devnum(sd_device **ret, char type, dev_t devnum) { | |
330 | assert_return(ret, -EINVAL); | |
331 | assert_return(IN_SET(type, 'b', 'c'), -EINVAL); | |
332 | ||
333 | return device_new_from_mode_and_devnum(ret, type == 'b' ? S_IFBLK : S_IFCHR, devnum); | |
57fa1d09 TG |
334 | } |
335 | ||
bd44a727 YW |
336 | static int device_new_from_main_ifname(sd_device **ret, const char *ifname) { |
337 | const char *syspath; | |
338 | ||
339 | assert(ret); | |
340 | assert(ifname); | |
341 | ||
342 | syspath = strjoina("/sys/class/net/", ifname); | |
343 | return sd_device_new_from_syspath(ret, syspath); | |
344 | } | |
345 | ||
346 | _public_ int sd_device_new_from_ifname(sd_device **ret, const char *ifname) { | |
347 | _cleanup_free_ char *main_name = NULL; | |
348 | int r; | |
349 | ||
350 | assert_return(ret, -EINVAL); | |
351 | assert_return(ifname, -EINVAL); | |
352 | ||
353 | r = parse_ifindex(ifname); | |
354 | if (r > 0) | |
355 | return sd_device_new_from_ifindex(ret, r); | |
356 | ||
357 | if (ifname_valid(ifname)) { | |
358 | r = device_new_from_main_ifname(ret, ifname); | |
359 | if (r >= 0) | |
360 | return r; | |
361 | } | |
362 | ||
363 | r = rtnl_resolve_link_alternative_name(NULL, ifname, &main_name); | |
364 | if (r < 0) | |
365 | return r; | |
366 | ||
367 | return device_new_from_main_ifname(ret, main_name); | |
368 | } | |
369 | ||
370 | _public_ int sd_device_new_from_ifindex(sd_device **ret, int ifindex) { | |
a46f9cd0 | 371 | _cleanup_(sd_device_unrefp) sd_device *dev = NULL; |
01afd0f7 | 372 | char ifname[IF_NAMESIZE]; |
a46f9cd0 | 373 | int r, i; |
bd44a727 YW |
374 | |
375 | assert_return(ret, -EINVAL); | |
376 | assert_return(ifindex > 0, -EINVAL); | |
377 | ||
01afd0f7 | 378 | if (format_ifname(ifindex, ifname) < 0) |
bd44a727 YW |
379 | return -ENODEV; |
380 | ||
a46f9cd0 YW |
381 | r = device_new_from_main_ifname(&dev, ifname); |
382 | if (r < 0) | |
383 | return r; | |
384 | ||
385 | r = sd_device_get_ifindex(dev, &i); | |
386 | if (r == -ENOENT) | |
387 | return -ENXIO; | |
388 | if (r < 0) | |
389 | return r; | |
390 | if (i != ifindex) | |
391 | return -ENXIO; | |
392 | ||
393 | *ret = TAKE_PTR(dev); | |
394 | return 0; | |
bd44a727 YW |
395 | } |
396 | ||
f5e77597 LP |
397 | static int device_strjoin_new( |
398 | const char *a, | |
399 | const char *b, | |
400 | const char *c, | |
401 | const char *d, | |
402 | sd_device **ret) { | |
403 | ||
404 | const char *p; | |
405 | int r; | |
406 | ||
407 | p = strjoina(a, b, c, d); | |
408 | if (access(p, F_OK) < 0) | |
409 | return IN_SET(errno, ENOENT, ENAMETOOLONG) ? 0 : -errno; /* If this sysfs is too long then it doesn't exist either */ | |
410 | ||
411 | r = sd_device_new_from_syspath(ret, p); | |
412 | if (r < 0) | |
413 | return r; | |
414 | ||
415 | return 1; | |
416 | } | |
417 | ||
418 | _public_ int sd_device_new_from_subsystem_sysname( | |
419 | sd_device **ret, | |
420 | const char *subsystem, | |
421 | const char *sysname) { | |
422 | ||
f5e77597 LP |
423 | char *name; |
424 | int r; | |
57fa1d09 TG |
425 | |
426 | assert_return(ret, -EINVAL); | |
f5e77597 LP |
427 | assert_return(path_is_normalized(subsystem), -EINVAL); |
428 | assert_return(path_is_normalized(sysname), -EINVAL); | |
57fa1d09 | 429 | |
4d38294b YW |
430 | /* translate sysname back to sysfs filename */ |
431 | name = strdupa_safe(sysname); | |
432 | string_replace_char(name, '/', '!'); | |
433 | ||
57fa1d09 | 434 | if (streq(subsystem, "subsystem")) { |
a43129b0 | 435 | FOREACH_STRING(s, "/sys/bus/", "/sys/class/") { |
4d38294b | 436 | r = device_strjoin_new(s, name, NULL, NULL, ret); |
f5e77597 LP |
437 | if (r < 0) |
438 | return r; | |
439 | if (r > 0) | |
440 | return 0; | |
441 | } | |
e17c95af | 442 | |
4d38294b YW |
443 | } else if (streq(subsystem, "module")) { |
444 | r = device_strjoin_new("/sys/module/", name, NULL, NULL, ret); | |
f5e77597 LP |
445 | if (r < 0) |
446 | return r; | |
447 | if (r > 0) | |
448 | return 0; | |
e17c95af | 449 | |
57fa1d09 | 450 | } else if (streq(subsystem, "drivers")) { |
f5e77597 | 451 | const char *sep; |
57fa1d09 | 452 | |
4d38294b | 453 | sep = strchr(name, ':'); |
52a89a5f | 454 | if (sep && sep[1] != '\0') { /* Require ":" and something non-empty after that. */ |
57fa1d09 | 455 | |
4d38294b | 456 | const char *subsys = memdupa_suffix0(name, sep - name); |
f5e77597 LP |
457 | sep++; |
458 | ||
0b859c97 LP |
459 | if (streq(sep, "drivers")) /* If the sysname is "drivers", then it's the drivers directory itself that is meant. */ |
460 | r = device_strjoin_new("/sys/bus/", subsys, "/drivers", NULL, ret); | |
461 | else | |
462 | r = device_strjoin_new("/sys/bus/", subsys, "/drivers/", sep, ret); | |
a43129b0 YW |
463 | if (r < 0) |
464 | return r; | |
465 | if (r > 0) | |
466 | return 0; | |
21d6220f TG |
467 | } |
468 | } | |
a9ec9f29 | 469 | |
a43129b0 YW |
470 | r = device_strjoin_new("/sys/bus/", subsystem, "/devices/", name, ret); |
471 | if (r < 0) | |
472 | return r; | |
473 | if (r > 0) | |
474 | return 0; | |
57fa1d09 | 475 | |
f5e77597 LP |
476 | r = device_strjoin_new("/sys/class/", subsystem, "/", name, ret); |
477 | if (r < 0) | |
478 | return r; | |
479 | if (r > 0) | |
480 | return 0; | |
57fa1d09 | 481 | |
4d38294b | 482 | r = device_strjoin_new("/sys/firmware/", subsystem, "/", name, ret); |
f5e77597 LP |
483 | if (r < 0) |
484 | return r; | |
485 | if (r > 0) | |
486 | return 0; | |
a918b673 | 487 | |
08232a02 | 488 | return -ENODEV; |
57fa1d09 TG |
489 | } |
490 | ||
a1130022 | 491 | _public_ int sd_device_new_from_stat_rdev(sd_device **ret, const struct stat *st) { |
a1130022 LP |
492 | assert_return(ret, -EINVAL); |
493 | assert_return(st, -EINVAL); | |
494 | ||
a46f9cd0 | 495 | return device_new_from_mode_and_devnum(ret, st->st_mode, st->st_rdev); |
a1130022 LP |
496 | } |
497 | ||
e418f965 YW |
498 | _public_ int sd_device_new_from_devname(sd_device **ret, const char *devname) { |
499 | struct stat st; | |
a46f9cd0 YW |
500 | dev_t devnum; |
501 | mode_t mode; | |
e418f965 YW |
502 | |
503 | assert_return(ret, -EINVAL); | |
504 | assert_return(devname, -EINVAL); | |
505 | ||
506 | /* This function actually accepts both devlinks and devnames, i.e. both symlinks and device | |
507 | * nodes below /dev/. */ | |
508 | ||
509 | /* Also ignore when the specified path is "/dev". */ | |
510 | if (isempty(path_startswith(devname, "/dev"))) | |
511 | return -EINVAL; | |
512 | ||
a46f9cd0 | 513 | if (device_path_parse_major_minor(devname, &mode, &devnum) >= 0) |
e418f965 | 514 | /* Let's shortcut when "/dev/block/maj:min" or "/dev/char/maj:min" is specified. |
a46f9cd0 | 515 | * In that case, we can directly convert the path to syspath, hence it is not necessary |
e418f965 | 516 | * that the specified path exists. So, this works fine without udevd being running. */ |
a46f9cd0 | 517 | return device_new_from_mode_and_devnum(ret, mode, devnum); |
e418f965 YW |
518 | |
519 | if (stat(devname, &st) < 0) | |
520 | return ERRNO_IS_DEVICE_ABSENT(errno) ? -ENODEV : -errno; | |
521 | ||
522 | return sd_device_new_from_stat_rdev(ret, &st); | |
523 | } | |
524 | ||
525 | _public_ int sd_device_new_from_path(sd_device **ret, const char *path) { | |
526 | assert_return(ret, -EINVAL); | |
527 | assert_return(path, -EINVAL); | |
528 | ||
529 | if (path_startswith(path, "/dev")) | |
530 | return sd_device_new_from_devname(ret, path); | |
531 | ||
95c250be | 532 | return device_new_from_syspath(ret, path, /* strict = */ false); |
e418f965 YW |
533 | } |
534 | ||
fe20121a ZJS |
535 | int device_set_devtype(sd_device *device, const char *devtype) { |
536 | _cleanup_free_ char *t = NULL; | |
57fa1d09 TG |
537 | int r; |
538 | ||
539 | assert(device); | |
fe20121a | 540 | assert(devtype); |
57fa1d09 | 541 | |
fe20121a ZJS |
542 | t = strdup(devtype); |
543 | if (!t) | |
57fa1d09 TG |
544 | return -ENOMEM; |
545 | ||
fe20121a | 546 | r = device_add_property_internal(device, "DEVTYPE", t); |
57fa1d09 TG |
547 | if (r < 0) |
548 | return r; | |
549 | ||
fe20121a | 550 | return free_and_replace(device->devtype, t); |
57fa1d09 TG |
551 | } |
552 | ||
597da51b ZJS |
553 | int device_set_ifindex(sd_device *device, const char *name) { |
554 | int r, ifindex; | |
57fa1d09 TG |
555 | |
556 | assert(device); | |
597da51b | 557 | assert(name); |
57fa1d09 | 558 | |
597da51b ZJS |
559 | ifindex = parse_ifindex(name); |
560 | if (ifindex < 0) | |
561 | return ifindex; | |
57fa1d09 | 562 | |
597da51b | 563 | r = device_add_property_internal(device, "IFINDEX", name); |
57fa1d09 TG |
564 | if (r < 0) |
565 | return r; | |
566 | ||
567 | device->ifindex = ifindex; | |
568 | ||
569 | return 0; | |
570 | } | |
571 | ||
70e45108 YW |
572 | static int mangle_devname(const char *p, char **ret) { |
573 | char *q; | |
574 | ||
575 | assert(p); | |
576 | assert(ret); | |
577 | ||
578 | if (!path_is_safe(p)) | |
579 | return -EINVAL; | |
580 | ||
581 | /* When the path is absolute, it must start with "/dev/", but ignore "/dev/" itself. */ | |
582 | if (path_is_absolute(p)) { | |
583 | if (isempty(path_startswith(p, "/dev/"))) | |
584 | return -EINVAL; | |
585 | ||
586 | q = strdup(p); | |
587 | } else | |
588 | q = path_join("/dev/", p); | |
589 | if (!q) | |
590 | return -ENOMEM; | |
591 | ||
592 | path_simplify(q); | |
593 | ||
594 | *ret = q; | |
595 | return 0; | |
596 | } | |
597 | ||
fe20121a ZJS |
598 | int device_set_devname(sd_device *device, const char *devname) { |
599 | _cleanup_free_ char *t = NULL; | |
57fa1d09 TG |
600 | int r; |
601 | ||
602 | assert(device); | |
fe20121a | 603 | assert(devname); |
57fa1d09 | 604 | |
70e45108 YW |
605 | r = mangle_devname(devname, &t); |
606 | if (r < 0) | |
607 | return r; | |
57fa1d09 | 608 | |
fe20121a | 609 | r = device_add_property_internal(device, "DEVNAME", t); |
57fa1d09 TG |
610 | if (r < 0) |
611 | return r; | |
612 | ||
fe20121a | 613 | return free_and_replace(device->devname, t); |
57fa1d09 TG |
614 | } |
615 | ||
616 | int device_set_devmode(sd_device *device, const char *_devmode) { | |
617 | unsigned devmode; | |
618 | int r; | |
619 | ||
620 | assert(device); | |
621 | assert(_devmode); | |
622 | ||
623 | r = safe_atou(_devmode, &devmode); | |
624 | if (r < 0) | |
625 | return r; | |
626 | ||
627 | if (devmode > 07777) | |
628 | return -EINVAL; | |
629 | ||
630 | r = device_add_property_internal(device, "DEVMODE", _devmode); | |
631 | if (r < 0) | |
632 | return r; | |
633 | ||
634 | device->devmode = devmode; | |
635 | ||
636 | return 0; | |
637 | } | |
638 | ||
639 | int device_set_devnum(sd_device *device, const char *major, const char *minor) { | |
49f23693 | 640 | unsigned maj, min = 0; |
57fa1d09 TG |
641 | int r; |
642 | ||
643 | assert(device); | |
644 | assert(major); | |
645 | ||
646 | r = safe_atou(major, &maj); | |
647 | if (r < 0) | |
648 | return r; | |
49f23693 | 649 | if (maj == 0) |
57fa1d09 | 650 | return 0; |
9d41c62f LP |
651 | if (!DEVICE_MAJOR_VALID(maj)) |
652 | return -EINVAL; | |
57fa1d09 TG |
653 | |
654 | if (minor) { | |
655 | r = safe_atou(minor, &min); | |
656 | if (r < 0) | |
657 | return r; | |
9d41c62f LP |
658 | if (!DEVICE_MINOR_VALID(min)) |
659 | return -EINVAL; | |
57fa1d09 TG |
660 | } |
661 | ||
662 | r = device_add_property_internal(device, "MAJOR", major); | |
663 | if (r < 0) | |
664 | return r; | |
665 | ||
666 | if (minor) { | |
667 | r = device_add_property_internal(device, "MINOR", minor); | |
668 | if (r < 0) | |
669 | return r; | |
670 | } | |
671 | ||
672 | device->devnum = makedev(maj, min); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
1ce0d040 LP |
677 | int device_set_diskseq(sd_device *device, const char *str) { |
678 | uint64_t diskseq; | |
679 | int r; | |
680 | ||
681 | assert(device); | |
682 | assert(str); | |
683 | ||
684 | r = safe_atou64(str, &diskseq); | |
685 | if (r < 0) | |
686 | return r; | |
687 | if (diskseq == 0) | |
688 | return -EINVAL; | |
689 | ||
690 | r = device_add_property_internal(device, "DISKSEQ", str); | |
691 | if (r < 0) | |
692 | return r; | |
693 | ||
694 | device->diskseq = diskseq; | |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
699 | static int handle_uevent_line( | |
700 | sd_device *device, | |
701 | const char *key, | |
702 | const char *value, | |
703 | const char **major, | |
704 | const char **minor) { | |
57fa1d09 TG |
705 | |
706 | assert(device); | |
707 | assert(key); | |
708 | assert(value); | |
709 | assert(major); | |
710 | assert(minor); | |
711 | ||
08405125 YW |
712 | if (streq(key, "DEVTYPE")) |
713 | return device_set_devtype(device, value); | |
714 | if (streq(key, "IFINDEX")) | |
715 | return device_set_ifindex(device, value); | |
716 | if (streq(key, "DEVNAME")) | |
717 | return device_set_devname(device, value); | |
718 | if (streq(key, "DEVMODE")) | |
719 | return device_set_devmode(device, value); | |
720 | if (streq(key, "DISKSEQ")) | |
721 | return device_set_diskseq(device, value); | |
722 | if (streq(key, "MAJOR")) | |
57fa1d09 TG |
723 | *major = value; |
724 | else if (streq(key, "MINOR")) | |
725 | *minor = value; | |
08405125 YW |
726 | else |
727 | return device_add_property_internal(device, key, value); | |
57fa1d09 TG |
728 | |
729 | return 0; | |
730 | } | |
731 | ||
732 | int device_read_uevent_file(sd_device *device) { | |
733 | _cleanup_free_ char *uevent = NULL; | |
97c94b98 | 734 | const char *syspath, *key = NULL, *value = NULL, *major = NULL, *minor = NULL; |
57fa1d09 TG |
735 | char *path; |
736 | size_t uevent_len; | |
57fa1d09 TG |
737 | int r; |
738 | ||
739 | enum { | |
740 | PRE_KEY, | |
741 | KEY, | |
742 | PRE_VALUE, | |
743 | VALUE, | |
744 | INVALID_LINE, | |
745 | } state = PRE_KEY; | |
746 | ||
747 | assert(device); | |
748 | ||
749 | if (device->uevent_loaded || device->sealed) | |
750 | return 0; | |
751 | ||
752 | r = sd_device_get_syspath(device, &syspath); | |
753 | if (r < 0) | |
754 | return r; | |
755 | ||
c7d6ebb1 YW |
756 | device->uevent_loaded = true; |
757 | ||
57fa1d09 TG |
758 | path = strjoina(syspath, "/uevent"); |
759 | ||
627055ce | 760 | r = read_full_virtual_file(path, &uevent, &uevent_len); |
c5ed77b2 | 761 | if (r == -EACCES || ERRNO_IS_NEG_DEVICE_ABSENT(r)) |
17761fb3 YW |
762 | /* The uevent files may be write-only, the device may be already removed, or the device |
763 | * may not have the uevent file. */ | |
c5ed77b2 ZJS |
764 | return 0; |
765 | if (r < 0) | |
c7d54dae | 766 | return log_device_debug_errno(device, r, "sd-device: Failed to read uevent file '%s': %m", path); |
57fa1d09 | 767 | |
462035d5 | 768 | for (size_t i = 0; i < uevent_len; i++) |
57fa1d09 TG |
769 | switch (state) { |
770 | case PRE_KEY: | |
771 | if (!strchr(NEWLINE, uevent[i])) { | |
772 | key = &uevent[i]; | |
773 | ||
774 | state = KEY; | |
775 | } | |
776 | ||
777 | break; | |
778 | case KEY: | |
779 | if (uevent[i] == '=') { | |
780 | uevent[i] = '\0'; | |
781 | ||
782 | state = PRE_VALUE; | |
783 | } else if (strchr(NEWLINE, uevent[i])) { | |
784 | uevent[i] = '\0'; | |
c7d54dae | 785 | log_device_debug(device, "sd-device: Invalid uevent line '%s', ignoring", key); |
57fa1d09 TG |
786 | |
787 | state = PRE_KEY; | |
788 | } | |
789 | ||
790 | break; | |
791 | case PRE_VALUE: | |
792 | value = &uevent[i]; | |
57fa1d09 TG |
793 | state = VALUE; |
794 | ||
4831981d | 795 | _fallthrough_; /* to handle empty property */ |
57fa1d09 TG |
796 | case VALUE: |
797 | if (strchr(NEWLINE, uevent[i])) { | |
798 | uevent[i] = '\0'; | |
799 | ||
800 | r = handle_uevent_line(device, key, value, &major, &minor); | |
801 | if (r < 0) | |
c7d54dae | 802 | log_device_debug_errno(device, r, "sd-device: Failed to handle uevent entry '%s=%s', ignoring: %m", key, value); |
57fa1d09 TG |
803 | |
804 | state = PRE_KEY; | |
805 | } | |
806 | ||
807 | break; | |
808 | default: | |
04499a70 | 809 | assert_not_reached(); |
57fa1d09 | 810 | } |
57fa1d09 TG |
811 | |
812 | if (major) { | |
813 | r = device_set_devnum(device, major, minor); | |
814 | if (r < 0) | |
9a81972b | 815 | log_device_debug_errno(device, r, "sd-device: Failed to set 'MAJOR=%s' or 'MINOR=%s' from '%s', ignoring: %m", major, strna(minor), path); |
57fa1d09 TG |
816 | } |
817 | ||
57fa1d09 TG |
818 | return 0; |
819 | } | |
820 | ||
821 | _public_ int sd_device_get_ifindex(sd_device *device, int *ifindex) { | |
822 | int r; | |
823 | ||
824 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
825 | |
826 | r = device_read_uevent_file(device); | |
827 | if (r < 0) | |
828 | return r; | |
829 | ||
1dfa9607 | 830 | if (device->ifindex <= 0) |
dcfbde3a YW |
831 | return -ENOENT; |
832 | ||
78ffb476 YW |
833 | if (ifindex) |
834 | *ifindex = device->ifindex; | |
57fa1d09 TG |
835 | |
836 | return 0; | |
837 | } | |
838 | ||
839 | _public_ int sd_device_new_from_device_id(sd_device **ret, const char *id) { | |
840 | int r; | |
841 | ||
842 | assert_return(ret, -EINVAL); | |
843 | assert_return(id, -EINVAL); | |
844 | ||
845 | switch (id[0]) { | |
846 | case 'b': | |
3a47c40d LP |
847 | case 'c': { |
848 | dev_t devt; | |
57fa1d09 | 849 | |
3a47c40d | 850 | if (isempty(id)) |
57fa1d09 TG |
851 | return -EINVAL; |
852 | ||
7176f06c | 853 | r = parse_devnum(id + 1, &devt); |
3a47c40d LP |
854 | if (r < 0) |
855 | return r; | |
856 | ||
857 | return sd_device_new_from_devnum(ret, id[0], devt); | |
57fa1d09 | 858 | } |
2cfb1978 ZJS |
859 | |
860 | case 'n': { | |
57fa1d09 TG |
861 | int ifindex; |
862 | ||
bd44a727 YW |
863 | ifindex = parse_ifindex(id + 1); |
864 | if (ifindex < 0) | |
865 | return ifindex; | |
57fa1d09 | 866 | |
bd44a727 | 867 | return sd_device_new_from_ifindex(ret, ifindex); |
57fa1d09 | 868 | } |
2cfb1978 ZJS |
869 | |
870 | case '+': { | |
3e2d0c6a | 871 | const char *subsys, *sep; |
57fa1d09 | 872 | |
3e2d0c6a ZJS |
873 | sep = strchr(id + 1, ':'); |
874 | if (!sep || sep - id - 1 > NAME_MAX) | |
57fa1d09 TG |
875 | return -EINVAL; |
876 | ||
3e2d0c6a | 877 | subsys = memdupa_suffix0(id + 1, sep - id - 1); |
57fa1d09 | 878 | |
3e2d0c6a | 879 | return sd_device_new_from_subsystem_sysname(ret, subsys, sep + 1); |
57fa1d09 | 880 | } |
2cfb1978 | 881 | |
57fa1d09 TG |
882 | default: |
883 | return -EINVAL; | |
884 | } | |
885 | } | |
886 | ||
887 | _public_ int sd_device_get_syspath(sd_device *device, const char **ret) { | |
888 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
889 | |
890 | assert(path_startswith(device->syspath, "/sys/")); | |
891 | ||
45e093a9 YW |
892 | if (ret) |
893 | *ret = device->syspath; | |
57fa1d09 TG |
894 | |
895 | return 0; | |
896 | } | |
897 | ||
ec9b4f2b YW |
898 | DEFINE_PRIVATE_HASH_OPS_FULL( |
899 | device_by_path_hash_ops, | |
900 | char, path_hash_func, path_compare, free, | |
901 | sd_device, sd_device_unref); | |
902 | ||
903 | static int device_enumerate_children_internal(sd_device *device, const char *subdir, Set **stack, Hashmap **children) { | |
904 | _cleanup_closedir_ DIR *dir = NULL; | |
905 | int r; | |
906 | ||
907 | assert(device); | |
908 | assert(stack); | |
909 | assert(children); | |
910 | ||
911 | r = device_opendir(device, subdir, &dir); | |
912 | if (r < 0) | |
913 | return r; | |
914 | ||
915 | FOREACH_DIRENT_ALL(de, dir, return -errno) { | |
916 | _cleanup_(sd_device_unrefp) sd_device *child = NULL; | |
917 | _cleanup_free_ char *p = NULL; | |
918 | ||
919 | if (dot_or_dot_dot(de->d_name)) | |
920 | continue; | |
921 | ||
922 | if (!IN_SET(de->d_type, DT_LNK, DT_DIR)) | |
923 | continue; | |
924 | ||
925 | if (subdir) | |
926 | p = path_join(subdir, de->d_name); | |
927 | else | |
928 | p = strdup(de->d_name); | |
929 | if (!p) | |
930 | return -ENOMEM; | |
931 | ||
932 | /* Try to create child device. */ | |
933 | r = sd_device_new_child(&child, device, p); | |
934 | if (r >= 0) { | |
935 | /* OK, this is a child device, saving it. */ | |
936 | r = hashmap_ensure_put(children, &device_by_path_hash_ops, p, child); | |
937 | if (r < 0) | |
938 | return r; | |
939 | ||
940 | TAKE_PTR(p); | |
941 | TAKE_PTR(child); | |
942 | } else if (r == -ENODEV) { | |
943 | /* This is not a child device. Push the sub-directory into stack, and read it later. */ | |
944 | ||
945 | if (de->d_type == DT_LNK) | |
946 | /* Do not follow symlinks, otherwise, we will enter an infinite loop, e.g., | |
947 | * /sys/class/block/nvme0n1/subsystem/nvme0n1/subsystem/nvme0n1/subsystem/… */ | |
948 | continue; | |
949 | ||
950 | r = set_ensure_consume(stack, &path_hash_ops_free, TAKE_PTR(p)); | |
951 | if (r < 0) | |
952 | return r; | |
953 | } else | |
954 | return r; | |
955 | } | |
956 | ||
957 | return 0; | |
958 | } | |
959 | ||
960 | static int device_enumerate_children(sd_device *device) { | |
961 | _cleanup_hashmap_free_ Hashmap *children = NULL; | |
962 | _cleanup_set_free_ Set *stack = NULL; | |
963 | int r; | |
964 | ||
965 | assert(device); | |
966 | ||
967 | if (device->children_enumerated) | |
968 | return 0; /* Already enumerated. */ | |
969 | ||
970 | r = device_enumerate_children_internal(device, NULL, &stack, &children); | |
971 | if (r < 0) | |
972 | return r; | |
973 | ||
974 | for (;;) { | |
975 | _cleanup_free_ char *subdir = NULL; | |
976 | ||
977 | subdir = set_steal_first(stack); | |
978 | if (!subdir) | |
979 | break; | |
980 | ||
981 | r = device_enumerate_children_internal(device, subdir, &stack, &children); | |
982 | if (r < 0) | |
983 | return r; | |
984 | } | |
985 | ||
986 | device->children_enumerated = true; | |
987 | device->children = TAKE_PTR(children); | |
988 | return 1; /* Enumerated. */ | |
989 | } | |
990 | ||
991 | _public_ sd_device *sd_device_get_child_first(sd_device *device, const char **ret_suffix) { | |
992 | int r; | |
993 | ||
994 | assert(device); | |
995 | ||
996 | r = device_enumerate_children(device); | |
997 | if (r < 0) { | |
998 | log_device_debug_errno(device, r, "sd-device: failed to enumerate child devices: %m"); | |
999 | if (ret_suffix) | |
1000 | *ret_suffix = NULL; | |
1001 | return NULL; | |
1002 | } | |
1003 | ||
1004 | device->children_iterator = ITERATOR_FIRST; | |
1005 | ||
1006 | return sd_device_get_child_next(device, ret_suffix); | |
1007 | } | |
1008 | ||
1009 | _public_ sd_device *sd_device_get_child_next(sd_device *device, const char **ret_suffix) { | |
1010 | sd_device *child; | |
1011 | ||
1012 | assert(device); | |
1013 | ||
5000cea8 | 1014 | (void) hashmap_iterate(device->children, &device->children_iterator, (void**) &child, (const void**) ret_suffix); |
ec9b4f2b YW |
1015 | return child; |
1016 | } | |
1017 | ||
68a52f59 YW |
1018 | _public_ int sd_device_new_child(sd_device **ret, sd_device *device, const char *suffix) { |
1019 | _cleanup_free_ char *path = NULL; | |
ec9b4f2b | 1020 | sd_device *child; |
68a52f59 YW |
1021 | const char *s; |
1022 | int r; | |
1023 | ||
1024 | assert_return(ret, -EINVAL); | |
1025 | assert_return(device, -EINVAL); | |
1026 | assert_return(suffix, -EINVAL); | |
1027 | ||
10a2f90d | 1028 | if (!path_is_safe(suffix)) |
68a52f59 YW |
1029 | return -EINVAL; |
1030 | ||
ec9b4f2b YW |
1031 | /* If we have already enumerated children, try to find the child from the cache. */ |
1032 | child = hashmap_get(device->children, suffix); | |
1033 | if (child) { | |
1034 | *ret = sd_device_ref(child); | |
1035 | return 0; | |
1036 | } | |
1037 | ||
68a52f59 YW |
1038 | r = sd_device_get_syspath(device, &s); |
1039 | if (r < 0) | |
1040 | return r; | |
1041 | ||
1042 | path = path_join(s, suffix); | |
1043 | if (!path) | |
1044 | return -ENOMEM; | |
1045 | ||
1046 | return sd_device_new_from_syspath(ret, path); | |
1047 | } | |
1048 | ||
57fa1d09 TG |
1049 | static int device_new_from_child(sd_device **ret, sd_device *child) { |
1050 | _cleanup_free_ char *path = NULL; | |
07c90f02 | 1051 | const char *syspath; |
57fa1d09 TG |
1052 | int r; |
1053 | ||
1054 | assert(ret); | |
1055 | assert(child); | |
1056 | ||
1057 | r = sd_device_get_syspath(child, &syspath); | |
1058 | if (r < 0) | |
1059 | return r; | |
1060 | ||
57fa1d09 | 1061 | for (;;) { |
07c90f02 | 1062 | _cleanup_free_ char *p = NULL; |
57fa1d09 | 1063 | |
07c90f02 YW |
1064 | r = path_extract_directory(path ?: syspath, &p); |
1065 | if (r < 0) | |
1066 | return r; | |
57fa1d09 | 1067 | |
07c90f02 YW |
1068 | if (path_equal(p, "/sys")) |
1069 | return -ENODEV; | |
57fa1d09 | 1070 | |
07c90f02 YW |
1071 | r = sd_device_new_from_syspath(ret, p); |
1072 | if (r != -ENODEV) | |
1073 | return r; | |
57fa1d09 | 1074 | |
07c90f02 | 1075 | free_and_replace(path, p); |
57fa1d09 | 1076 | } |
57fa1d09 TG |
1077 | } |
1078 | ||
1079 | _public_ int sd_device_get_parent(sd_device *child, sd_device **ret) { | |
df88f02b YW |
1080 | int r; |
1081 | ||
57fa1d09 TG |
1082 | assert_return(child, -EINVAL); |
1083 | ||
1084 | if (!child->parent_set) { | |
df88f02b YW |
1085 | r = device_new_from_child(&child->parent, child); |
1086 | if (r < 0 && r != -ENODEV) | |
1087 | return r; | |
57fa1d09 | 1088 | |
df88f02b | 1089 | child->parent_set = true; |
57fa1d09 TG |
1090 | } |
1091 | ||
1092 | if (!child->parent) | |
1093 | return -ENOENT; | |
1094 | ||
45e093a9 YW |
1095 | if (ret) |
1096 | *ret = child->parent; | |
57fa1d09 TG |
1097 | return 0; |
1098 | } | |
1099 | ||
df49a732 ZJS |
1100 | int device_set_subsystem(sd_device *device, const char *subsystem) { |
1101 | _cleanup_free_ char *s = NULL; | |
57fa1d09 TG |
1102 | int r; |
1103 | ||
1104 | assert(device); | |
57fa1d09 | 1105 | |
df49a732 ZJS |
1106 | if (subsystem) { |
1107 | s = strdup(subsystem); | |
1108 | if (!s) | |
1109 | return -ENOMEM; | |
1110 | } | |
57fa1d09 | 1111 | |
df49a732 | 1112 | r = device_add_property_internal(device, "SUBSYSTEM", s); |
57fa1d09 TG |
1113 | if (r < 0) |
1114 | return r; | |
1115 | ||
57fa1d09 | 1116 | device->subsystem_set = true; |
df49a732 | 1117 | return free_and_replace(device->subsystem, s); |
57fa1d09 TG |
1118 | } |
1119 | ||
e5ca293f | 1120 | int device_set_drivers_subsystem(sd_device *device) { |
de7e983e | 1121 | _cleanup_free_ char *subsystem = NULL; |
13659527 | 1122 | const char *devpath, *drivers, *p; |
de7e983e TG |
1123 | int r; |
1124 | ||
1125 | assert(device); | |
de7e983e | 1126 | |
13659527 | 1127 | r = sd_device_get_devpath(device, &devpath); |
4956f220 YW |
1128 | if (r < 0) |
1129 | return r; | |
1130 | ||
13659527 | 1131 | drivers = strstr(devpath, "/drivers/"); |
0b859c97 LP |
1132 | if (!drivers) |
1133 | drivers = endswith(devpath, "/drivers"); | |
4956f220 YW |
1134 | if (!drivers) |
1135 | return -EINVAL; | |
1136 | ||
be247835 LP |
1137 | /* Find the path component immediately before the "/drivers/" string */ |
1138 | r = path_find_last_component(devpath, /* accept_dot_dot= */ false, &drivers, &p); | |
13659527 YW |
1139 | if (r < 0) |
1140 | return r; | |
1141 | if (r == 0) | |
4956f220 YW |
1142 | return -EINVAL; |
1143 | ||
13659527 | 1144 | subsystem = strndup(p, r); |
de7e983e TG |
1145 | if (!subsystem) |
1146 | return -ENOMEM; | |
1147 | ||
1148 | r = device_set_subsystem(device, "drivers"); | |
1149 | if (r < 0) | |
1150 | return r; | |
1151 | ||
2cfb1978 | 1152 | return free_and_replace(device->driver_subsystem, subsystem); |
de7e983e TG |
1153 | } |
1154 | ||
57fa1d09 | 1155 | _public_ int sd_device_get_subsystem(sd_device *device, const char **ret) { |
de7e983e TG |
1156 | int r; |
1157 | ||
57fa1d09 TG |
1158 | assert_return(device, -EINVAL); |
1159 | ||
1160 | if (!device->subsystem_set) { | |
1161 | _cleanup_free_ char *subsystem = NULL; | |
4956f220 | 1162 | const char *syspath; |
57fa1d09 | 1163 | char *path; |
57fa1d09 | 1164 | |
4956f220 YW |
1165 | r = sd_device_get_syspath(device, &syspath); |
1166 | if (r < 0) | |
1167 | return r; | |
1168 | ||
57fa1d09 | 1169 | /* read 'subsystem' link */ |
57fa1d09 TG |
1170 | path = strjoina(syspath, "/subsystem"); |
1171 | r = readlink_value(path, &subsystem); | |
4956f220 YW |
1172 | if (r < 0 && r != -ENOENT) |
1173 | return log_device_debug_errno(device, r, | |
1174 | "sd-device: Failed to read subsystem for %s: %m", | |
1175 | device->devpath); | |
1176 | ||
1177 | if (subsystem) | |
57fa1d09 TG |
1178 | r = device_set_subsystem(device, subsystem); |
1179 | /* use implicit names */ | |
0b859c97 | 1180 | else if (!isempty(path_startswith(device->devpath, "/module/"))) |
57fa1d09 | 1181 | r = device_set_subsystem(device, "module"); |
0b859c97 | 1182 | else if (strstr(syspath, "/drivers/") || endswith(syspath, "/drivers")) |
4956f220 | 1183 | r = device_set_drivers_subsystem(device); |
0b859c97 | 1184 | else if (!isempty(PATH_STARTSWITH_SET(device->devpath, "/class/", "/bus/"))) |
57fa1d09 | 1185 | r = device_set_subsystem(device, "subsystem"); |
4956f220 YW |
1186 | else { |
1187 | device->subsystem_set = true; | |
1188 | r = 0; | |
de7e983e | 1189 | } |
4956f220 YW |
1190 | if (r < 0) |
1191 | return log_device_debug_errno(device, r, | |
1192 | "sd-device: Failed to set subsystem for %s: %m", | |
1193 | device->devpath); | |
57fa1d09 TG |
1194 | } |
1195 | ||
bf4c113e DH |
1196 | if (!device->subsystem) |
1197 | return -ENOENT; | |
1198 | ||
45e093a9 YW |
1199 | if (ret) |
1200 | *ret = device->subsystem; | |
57fa1d09 TG |
1201 | return 0; |
1202 | } | |
1203 | ||
1204 | _public_ int sd_device_get_devtype(sd_device *device, const char **devtype) { | |
1205 | int r; | |
1206 | ||
730b76bd | 1207 | assert_return(device, -EINVAL); |
57fa1d09 TG |
1208 | |
1209 | r = device_read_uevent_file(device); | |
1210 | if (r < 0) | |
1211 | return r; | |
1212 | ||
dcfbde3a YW |
1213 | if (!device->devtype) |
1214 | return -ENOENT; | |
1215 | ||
730b76bd ZJS |
1216 | if (devtype) |
1217 | *devtype = device->devtype; | |
57fa1d09 | 1218 | |
730b76bd | 1219 | return !!device->devtype; |
57fa1d09 TG |
1220 | } |
1221 | ||
1222 | _public_ int sd_device_get_parent_with_subsystem_devtype(sd_device *child, const char *subsystem, const char *devtype, sd_device **ret) { | |
1223 | sd_device *parent = NULL; | |
1224 | int r; | |
1225 | ||
1226 | assert_return(child, -EINVAL); | |
1227 | assert_return(subsystem, -EINVAL); | |
1228 | ||
1229 | r = sd_device_get_parent(child, &parent); | |
1230 | while (r >= 0) { | |
1231 | const char *parent_subsystem = NULL; | |
57fa1d09 | 1232 | |
db2f8a2e | 1233 | (void) sd_device_get_subsystem(parent, &parent_subsystem); |
57fa1d09 | 1234 | if (streq_ptr(parent_subsystem, subsystem)) { |
45e093a9 YW |
1235 | const char *parent_devtype = NULL; |
1236 | ||
57fa1d09 TG |
1237 | if (!devtype) |
1238 | break; | |
1239 | ||
db2f8a2e | 1240 | (void) sd_device_get_devtype(parent, &parent_devtype); |
57fa1d09 TG |
1241 | if (streq_ptr(parent_devtype, devtype)) |
1242 | break; | |
1243 | } | |
1244 | r = sd_device_get_parent(parent, &parent); | |
1245 | } | |
1246 | ||
1247 | if (r < 0) | |
1248 | return r; | |
1249 | ||
45e093a9 YW |
1250 | if (ret) |
1251 | *ret = parent; | |
57fa1d09 TG |
1252 | return 0; |
1253 | } | |
1254 | ||
1255 | _public_ int sd_device_get_devnum(sd_device *device, dev_t *devnum) { | |
1256 | int r; | |
1257 | ||
1258 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
1259 | |
1260 | r = device_read_uevent_file(device); | |
1261 | if (r < 0) | |
1262 | return r; | |
1263 | ||
dcfbde3a YW |
1264 | if (major(device->devnum) <= 0) |
1265 | return -ENOENT; | |
1266 | ||
78ffb476 YW |
1267 | if (devnum) |
1268 | *devnum = device->devnum; | |
57fa1d09 TG |
1269 | |
1270 | return 0; | |
1271 | } | |
1272 | ||
ca0176fa ZJS |
1273 | int device_set_driver(sd_device *device, const char *driver) { |
1274 | _cleanup_free_ char *d = NULL; | |
57fa1d09 TG |
1275 | int r; |
1276 | ||
1277 | assert(device); | |
57fa1d09 | 1278 | |
ca0176fa ZJS |
1279 | if (driver) { |
1280 | d = strdup(driver); | |
1281 | if (!d) | |
1282 | return -ENOMEM; | |
1283 | } | |
57fa1d09 | 1284 | |
ca0176fa | 1285 | r = device_add_property_internal(device, "DRIVER", d); |
57fa1d09 TG |
1286 | if (r < 0) |
1287 | return r; | |
1288 | ||
57fa1d09 | 1289 | device->driver_set = true; |
ca0176fa | 1290 | return free_and_replace(device->driver, d); |
57fa1d09 TG |
1291 | } |
1292 | ||
1293 | _public_ int sd_device_get_driver(sd_device *device, const char **ret) { | |
1294 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
1295 | |
1296 | if (!device->driver_set) { | |
1297 | _cleanup_free_ char *driver = NULL; | |
1298 | const char *syspath; | |
1299 | char *path; | |
1300 | int r; | |
1301 | ||
1302 | r = sd_device_get_syspath(device, &syspath); | |
1303 | if (r < 0) | |
1304 | return r; | |
1305 | ||
1306 | path = strjoina(syspath, "/driver"); | |
1307 | r = readlink_value(path, &driver); | |
ca0176fa ZJS |
1308 | if (r < 0 && r != -ENOENT) |
1309 | return log_device_debug_errno(device, r, | |
1310 | "sd-device: readlink(\"%s\") failed: %m", path); | |
1311 | ||
1312 | r = device_set_driver(device, driver); | |
1313 | if (r < 0) | |
1314 | return log_device_debug_errno(device, r, | |
1315 | "sd-device: Failed to set driver \"%s\": %m", driver); | |
57fa1d09 TG |
1316 | } |
1317 | ||
bf4c113e DH |
1318 | if (!device->driver) |
1319 | return -ENOENT; | |
1320 | ||
45e093a9 YW |
1321 | if (ret) |
1322 | *ret = device->driver; | |
57fa1d09 TG |
1323 | return 0; |
1324 | } | |
1325 | ||
d4df6ce2 | 1326 | _public_ int sd_device_get_devpath(sd_device *device, const char **ret) { |
57fa1d09 | 1327 | assert_return(device, -EINVAL); |
57fa1d09 TG |
1328 | |
1329 | assert(device->devpath); | |
1330 | assert(device->devpath[0] == '/'); | |
1331 | ||
d4df6ce2 LP |
1332 | if (ret) |
1333 | *ret = device->devpath; | |
1334 | ||
57fa1d09 TG |
1335 | return 0; |
1336 | } | |
1337 | ||
1338 | _public_ int sd_device_get_devname(sd_device *device, const char **devname) { | |
1339 | int r; | |
1340 | ||
1341 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
1342 | |
1343 | r = device_read_uevent_file(device); | |
1344 | if (r < 0) | |
1345 | return r; | |
1346 | ||
1347 | if (!device->devname) | |
1348 | return -ENOENT; | |
1349 | ||
70e45108 | 1350 | assert(!isempty(path_startswith(device->devname, "/dev/"))); |
57fa1d09 | 1351 | |
45e093a9 YW |
1352 | if (devname) |
1353 | *devname = device->devname; | |
57fa1d09 TG |
1354 | return 0; |
1355 | } | |
1356 | ||
6e25642f | 1357 | static int device_set_sysname_and_sysnum(sd_device *device) { |
57fa1d09 | 1358 | _cleanup_free_ char *sysname = NULL; |
9dbfcaf2 | 1359 | size_t len, n; |
5fa9d220 | 1360 | int r; |
57fa1d09 | 1361 | |
c58e0ce6 | 1362 | assert(device); |
57fa1d09 | 1363 | |
c58e0ce6 YW |
1364 | r = path_extract_filename(device->devpath, &sysname); |
1365 | if (r < 0) | |
1366 | return r; | |
e4e1353c YW |
1367 | if (r == O_DIRECTORY) |
1368 | return -EINVAL; | |
57fa1d09 TG |
1369 | |
1370 | /* some devices have '!' in their name, change that to '/' */ | |
9dbfcaf2 | 1371 | string_replace_char(sysname, '!', '/'); |
57fa1d09 | 1372 | |
9dbfcaf2 YW |
1373 | n = strspn_from_end(sysname, DIGITS); |
1374 | len = strlen(sysname); | |
1375 | assert(n <= len); | |
1376 | if (n == len) | |
1377 | n = 0; /* Do not set sysnum for number only sysname. */ | |
57fa1d09 | 1378 | |
9dbfcaf2 | 1379 | device->sysnum = n > 0 ? sysname + len - n : NULL; |
2cfb1978 | 1380 | return free_and_replace(device->sysname, sysname); |
57fa1d09 TG |
1381 | } |
1382 | ||
1383 | _public_ int sd_device_get_sysname(sd_device *device, const char **ret) { | |
1384 | int r; | |
1385 | ||
1386 | assert_return(device, -EINVAL); | |
57fa1d09 | 1387 | |
6e25642f YW |
1388 | if (!device->sysname) { |
1389 | r = device_set_sysname_and_sysnum(device); | |
57fa1d09 TG |
1390 | if (r < 0) |
1391 | return r; | |
1392 | } | |
1393 | ||
45e093a9 YW |
1394 | if (ret) |
1395 | *ret = device->sysname; | |
57fa1d09 TG |
1396 | return 0; |
1397 | } | |
1398 | ||
1399 | _public_ int sd_device_get_sysnum(sd_device *device, const char **ret) { | |
1400 | int r; | |
1401 | ||
1402 | assert_return(device, -EINVAL); | |
57fa1d09 | 1403 | |
6e25642f YW |
1404 | if (!device->sysname) { |
1405 | r = device_set_sysname_and_sysnum(device); | |
57fa1d09 TG |
1406 | if (r < 0) |
1407 | return r; | |
1408 | } | |
1409 | ||
dcfbde3a YW |
1410 | if (!device->sysnum) |
1411 | return -ENOENT; | |
1412 | ||
45e093a9 YW |
1413 | if (ret) |
1414 | *ret = device->sysnum; | |
57fa1d09 TG |
1415 | return 0; |
1416 | } | |
1417 | ||
a1130022 LP |
1418 | _public_ int sd_device_get_action(sd_device *device, sd_device_action_t *ret) { |
1419 | assert_return(device, -EINVAL); | |
1420 | ||
1421 | if (device->action < 0) | |
1422 | return -ENOENT; | |
1423 | ||
1424 | if (ret) | |
1425 | *ret = device->action; | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | _public_ int sd_device_get_seqnum(sd_device *device, uint64_t *ret) { | |
1431 | assert_return(device, -EINVAL); | |
1432 | ||
1433 | if (device->seqnum == 0) | |
1434 | return -ENOENT; | |
1435 | ||
1436 | if (ret) | |
1437 | *ret = device->seqnum; | |
1438 | ||
1439 | return 0; | |
1440 | } | |
1441 | ||
122adcb2 | 1442 | _public_ int sd_device_get_diskseq(sd_device *device, uint64_t *ret) { |
becbcca5 YW |
1443 | int r; |
1444 | ||
122adcb2 LB |
1445 | assert_return(device, -EINVAL); |
1446 | ||
becbcca5 YW |
1447 | r = device_read_uevent_file(device); |
1448 | if (r < 0) | |
1449 | return r; | |
1450 | ||
122adcb2 LB |
1451 | if (device->diskseq == 0) |
1452 | return -ENOENT; | |
1453 | ||
1454 | if (ret) | |
1455 | *ret = device->diskseq; | |
1456 | ||
1457 | return 0; | |
1458 | } | |
1459 | ||
57fa1d09 TG |
1460 | static bool is_valid_tag(const char *tag) { |
1461 | assert(tag); | |
1462 | ||
0b4c70b4 | 1463 | return in_charset(tag, ALPHANUMERICAL "-_") && filename_is_valid(tag); |
57fa1d09 TG |
1464 | } |
1465 | ||
e77b146f LP |
1466 | int device_add_tag(sd_device *device, const char *tag, bool both) { |
1467 | int r, added; | |
57fa1d09 TG |
1468 | |
1469 | assert(device); | |
1470 | assert(tag); | |
1471 | ||
1472 | if (!is_valid_tag(tag)) | |
1473 | return -EINVAL; | |
1474 | ||
e77b146f LP |
1475 | /* Definitely add to the "all" list of tags (i.e. the sticky list) */ |
1476 | added = set_put_strdup(&device->all_tags, tag); | |
1477 | if (added < 0) | |
1478 | return added; | |
1479 | ||
1480 | /* And optionally, also add it to the current list of tags */ | |
1481 | if (both) { | |
1482 | r = set_put_strdup(&device->current_tags, tag); | |
1483 | if (r < 0) { | |
1484 | if (added > 0) | |
1485 | (void) set_remove(device->all_tags, tag); | |
1486 | ||
1487 | return r; | |
1488 | } | |
1489 | } | |
57fa1d09 | 1490 | |
313cefa1 | 1491 | device->tags_generation++; |
57fa1d09 TG |
1492 | device->property_tags_outdated = true; |
1493 | ||
1494 | return 0; | |
1495 | } | |
1496 | ||
1497 | int device_add_devlink(sd_device *device, const char *devlink) { | |
2c5f119c | 1498 | char *p; |
57fa1d09 TG |
1499 | int r; |
1500 | ||
1501 | assert(device); | |
1502 | assert(devlink); | |
1503 | ||
70e45108 YW |
1504 | r = mangle_devname(devlink, &p); |
1505 | if (r < 0) | |
1506 | return r; | |
2c5f119c YW |
1507 | |
1508 | r = set_ensure_consume(&device->devlinks, &path_hash_ops_free, p); | |
57fa1d09 TG |
1509 | if (r < 0) |
1510 | return r; | |
1511 | ||
313cefa1 | 1512 | device->devlinks_generation++; |
57fa1d09 TG |
1513 | device->property_devlinks_outdated = true; |
1514 | ||
2c5f119c | 1515 | return r; /* return 1 when newly added, 0 when already exists */ |
57fa1d09 TG |
1516 | } |
1517 | ||
2c5f119c YW |
1518 | int device_remove_devlink(sd_device *device, const char *devlink) { |
1519 | _cleanup_free_ char *p = NULL, *s = NULL; | |
70e45108 | 1520 | int r; |
aeefa4d2 FB |
1521 | |
1522 | assert(device); | |
1523 | assert(devlink); | |
1524 | ||
70e45108 YW |
1525 | r = mangle_devname(devlink, &p); |
1526 | if (r < 0) | |
1527 | return r; | |
2c5f119c YW |
1528 | |
1529 | s = set_remove(device->devlinks, p); | |
aeefa4d2 | 1530 | if (!s) |
2c5f119c | 1531 | return 0; /* does not exist */ |
aeefa4d2 FB |
1532 | |
1533 | device->devlinks_generation++; | |
1534 | device->property_devlinks_outdated = true; | |
2c5f119c | 1535 | return 1; /* removed */ |
aeefa4d2 FB |
1536 | } |
1537 | ||
b881ce16 YW |
1538 | bool device_has_devlink(sd_device *device, const char *devlink) { |
1539 | assert(device); | |
1540 | assert(devlink); | |
1541 | ||
1542 | return set_contains(device->devlinks, devlink); | |
1543 | } | |
1544 | ||
57fa1d09 TG |
1545 | static int device_add_property_internal_from_string(sd_device *device, const char *str) { |
1546 | _cleanup_free_ char *key = NULL; | |
1547 | char *value; | |
03dd7b7d | 1548 | int r; |
57fa1d09 TG |
1549 | |
1550 | assert(device); | |
1551 | assert(str); | |
1552 | ||
1553 | key = strdup(str); | |
1554 | if (!key) | |
1555 | return -ENOMEM; | |
1556 | ||
1557 | value = strchr(key, '='); | |
1558 | if (!value) | |
1559 | return -EINVAL; | |
1560 | ||
1561 | *value = '\0'; | |
1562 | ||
1563 | if (isempty(++value)) | |
1564 | value = NULL; | |
1565 | ||
03dd7b7d YW |
1566 | /* Add the property to both sd_device::properties and sd_device::properties_db, |
1567 | * as this is called by only handle_db_line(). */ | |
1568 | r = device_add_property_aux(device, key, value, false); | |
1569 | if (r < 0) | |
1570 | return r; | |
1571 | ||
1572 | return device_add_property_aux(device, key, value, true); | |
57fa1d09 TG |
1573 | } |
1574 | ||
dc5042c0 ZJS |
1575 | int device_set_usec_initialized(sd_device *device, usec_t when) { |
1576 | char s[DECIMAL_STR_MAX(usec_t)]; | |
57fa1d09 TG |
1577 | int r; |
1578 | ||
1579 | assert(device); | |
57fa1d09 | 1580 | |
dc5042c0 | 1581 | xsprintf(s, USEC_FMT, when); |
57fa1d09 | 1582 | |
dc5042c0 | 1583 | r = device_add_property_internal(device, "USEC_INITIALIZED", s); |
57fa1d09 TG |
1584 | if (r < 0) |
1585 | return r; | |
1586 | ||
dc5042c0 | 1587 | device->usec_initialized = when; |
57fa1d09 TG |
1588 | return 0; |
1589 | } | |
1590 | ||
1591 | static int handle_db_line(sd_device *device, char key, const char *value) { | |
57fa1d09 TG |
1592 | int r; |
1593 | ||
1594 | assert(device); | |
1595 | assert(value); | |
1596 | ||
1597 | switch (key) { | |
e77b146f LP |
1598 | case 'G': /* Any tag */ |
1599 | case 'Q': /* Current tag */ | |
08405125 | 1600 | return device_add_tag(device, value, key == 'Q'); |
57fa1d09 | 1601 | |
08405125 YW |
1602 | case 'S': { |
1603 | const char *path; | |
57fa1d09 | 1604 | |
08405125 YW |
1605 | path = strjoina("/dev/", value); |
1606 | return device_add_devlink(device, path); | |
1607 | } | |
57fa1d09 | 1608 | case 'E': |
08405125 | 1609 | return device_add_property_internal_from_string(device, value); |
57fa1d09 | 1610 | |
dc5042c0 ZJS |
1611 | case 'I': { |
1612 | usec_t t; | |
1613 | ||
1614 | r = safe_atou64(value, &t); | |
1615 | if (r < 0) | |
1616 | return r; | |
1617 | ||
08405125 | 1618 | return device_set_usec_initialized(device, t); |
dc5042c0 | 1619 | } |
57fa1d09 | 1620 | case 'L': |
08405125 | 1621 | return safe_atoi(value, &device->devlink_priority); |
57fa1d09 | 1622 | |
57fa1d09 | 1623 | case 'W': |
e7f781e4 YW |
1624 | /* Deprecated. Previously, watch handle is both saved in database and /run/udev/watch. |
1625 | * However, the handle saved in database may not be updated when the handle is updated | |
1626 | * or removed. Moreover, it is not necessary to store the handle within the database, | |
1627 | * as its value becomes meaningless when udevd is restarted. */ | |
08405125 YW |
1628 | return 0; |
1629 | ||
58b30ada | 1630 | case 'V': |
08405125 | 1631 | return safe_atou(value, &device->database_version); |
58b30ada | 1632 | |
57fa1d09 | 1633 | default: |
c7d54dae | 1634 | log_device_debug(device, "sd-device: Unknown key '%c' in device db, ignoring", key); |
08405125 | 1635 | return 0; |
57fa1d09 | 1636 | } |
57fa1d09 TG |
1637 | } |
1638 | ||
fe732381 | 1639 | int device_get_device_id(sd_device *device, const char **ret) { |
57fa1d09 TG |
1640 | assert(device); |
1641 | assert(ret); | |
1642 | ||
fe732381 | 1643 | if (!device->device_id) { |
57fa1d09 TG |
1644 | _cleanup_free_ char *id = NULL; |
1645 | const char *subsystem; | |
1646 | dev_t devnum; | |
1647 | int ifindex, r; | |
1648 | ||
1649 | r = sd_device_get_subsystem(device, &subsystem); | |
1650 | if (r < 0) | |
1651 | return r; | |
1652 | ||
dcfbde3a | 1653 | if (sd_device_get_devnum(device, &devnum) >= 0) { |
ccddd104 | 1654 | /* use dev_t — b259:131072, c254:0 */ |
67458536 | 1655 | if (asprintf(&id, "%c" DEVNUM_FORMAT_STR, |
57fa1d09 | 1656 | streq(subsystem, "block") ? 'b' : 'c', |
67458536 | 1657 | DEVNUM_FORMAT_VAL(devnum)) < 0) |
53fae771 | 1658 | return -ENOMEM; |
1dfa9607 | 1659 | } else if (sd_device_get_ifindex(device, &ifindex) >= 0) { |
ccddd104 | 1660 | /* use netdev ifindex — n3 */ |
ce1d08ba | 1661 | if (asprintf(&id, "n%u", (unsigned) ifindex) < 0) |
53fae771 | 1662 | return -ENOMEM; |
57fa1d09 | 1663 | } else { |
ce1d08ba | 1664 | _cleanup_free_ char *sysname = NULL; |
4189708a | 1665 | |
ce1d08ba YW |
1666 | /* use $subsys:$sysname — pci:0000:00:1f.2 |
1667 | * sd_device_get_sysname() has '!' translated, get it from devpath */ | |
1668 | r = path_extract_filename(device->devpath, &sysname); | |
1669 | if (r < 0) | |
1670 | return r; | |
e4e1353c YW |
1671 | if (r == O_DIRECTORY) |
1672 | return -EINVAL; | |
57fa1d09 | 1673 | |
ce1d08ba YW |
1674 | if (streq(subsystem, "drivers")) { |
1675 | /* the 'drivers' pseudo-subsystem is special, and needs the real | |
1676 | * subsystem encoded as well */ | |
1677 | assert(device->driver_subsystem); | |
fe20121a | 1678 | id = strjoin("+drivers:", device->driver_subsystem, ":", sysname); |
ce1d08ba | 1679 | } else |
fe20121a ZJS |
1680 | id = strjoin("+", subsystem, ":", sysname); |
1681 | if (!id) | |
1682 | return -ENOMEM; | |
57fa1d09 TG |
1683 | } |
1684 | ||
db2bad43 YW |
1685 | if (!filename_is_valid(id)) |
1686 | return -EINVAL; | |
1687 | ||
fe732381 | 1688 | device->device_id = TAKE_PTR(id); |
57fa1d09 TG |
1689 | } |
1690 | ||
fe732381 | 1691 | *ret = device->device_id; |
57fa1d09 TG |
1692 | return 0; |
1693 | } | |
1694 | ||
b07d0f2a | 1695 | int device_read_db_internal_filename(sd_device *device, const char *filename) { |
57fa1d09 | 1696 | _cleanup_free_ char *db = NULL; |
b07d0f2a | 1697 | const char *value; |
462035d5 | 1698 | size_t db_len; |
376ee2c3 | 1699 | char key = '\0'; /* Unnecessary initialization to appease gcc-12.0.0-0.4.fc36 */ |
57fa1d09 TG |
1700 | int r; |
1701 | ||
1702 | enum { | |
1703 | PRE_KEY, | |
1704 | KEY, | |
1705 | PRE_VALUE, | |
1706 | VALUE, | |
1707 | INVALID_LINE, | |
1708 | } state = PRE_KEY; | |
1709 | ||
ebcc52fa | 1710 | assert(device); |
b07d0f2a | 1711 | assert(filename); |
ebcc52fa | 1712 | |
b07d0f2a | 1713 | r = read_full_file(filename, &db, &db_len); |
57fa1d09 TG |
1714 | if (r < 0) { |
1715 | if (r == -ENOENT) | |
1716 | return 0; | |
b07d0f2a YW |
1717 | |
1718 | return log_device_debug_errno(device, r, "sd-device: Failed to read db '%s': %m", filename); | |
57fa1d09 TG |
1719 | } |
1720 | ||
1721 | /* devices with a database entry are initialized */ | |
7e518afa | 1722 | device->is_initialized = true; |
57fa1d09 | 1723 | |
cd53c8f9 ZJS |
1724 | device->db_loaded = true; |
1725 | ||
e47a3af4 | 1726 | for (size_t i = 0; i < db_len; i++) |
57fa1d09 TG |
1727 | switch (state) { |
1728 | case PRE_KEY: | |
1729 | if (!strchr(NEWLINE, db[i])) { | |
1730 | key = db[i]; | |
1731 | ||
1732 | state = KEY; | |
1733 | } | |
1734 | ||
1735 | break; | |
1736 | case KEY: | |
1737 | if (db[i] != ':') { | |
c7d54dae | 1738 | log_device_debug(device, "sd-device: Invalid db entry with key '%c', ignoring", key); |
57fa1d09 TG |
1739 | |
1740 | state = INVALID_LINE; | |
1741 | } else { | |
1742 | db[i] = '\0'; | |
1743 | ||
1744 | state = PRE_VALUE; | |
1745 | } | |
1746 | ||
1747 | break; | |
1748 | case PRE_VALUE: | |
1749 | value = &db[i]; | |
1750 | ||
1751 | state = VALUE; | |
1752 | ||
1753 | break; | |
1754 | case INVALID_LINE: | |
1755 | if (strchr(NEWLINE, db[i])) | |
1756 | state = PRE_KEY; | |
1757 | ||
1758 | break; | |
1759 | case VALUE: | |
1760 | if (strchr(NEWLINE, db[i])) { | |
1761 | db[i] = '\0'; | |
1762 | r = handle_db_line(device, key, value); | |
1763 | if (r < 0) | |
462035d5 ZJS |
1764 | log_device_debug_errno(device, r, "sd-device: Failed to handle db entry '%c:%s', ignoring: %m", |
1765 | key, value); | |
57fa1d09 TG |
1766 | |
1767 | state = PRE_KEY; | |
1768 | } | |
1769 | ||
1770 | break; | |
1771 | default: | |
b07d0f2a | 1772 | return log_device_debug_errno(device, SYNTHETIC_ERRNO(EINVAL), "sd-device: invalid db syntax."); |
57fa1d09 | 1773 | } |
57fa1d09 | 1774 | |
57fa1d09 TG |
1775 | return 0; |
1776 | } | |
1777 | ||
b07d0f2a YW |
1778 | int device_read_db_internal(sd_device *device, bool force) { |
1779 | const char *id, *path; | |
1780 | int r; | |
1781 | ||
1782 | assert(device); | |
1783 | ||
1784 | if (device->db_loaded || (!force && device->sealed)) | |
1785 | return 0; | |
1786 | ||
fe732381 | 1787 | r = device_get_device_id(device, &id); |
b07d0f2a YW |
1788 | if (r < 0) |
1789 | return r; | |
1790 | ||
1791 | path = strjoina("/run/udev/data/", id); | |
1792 | ||
1793 | return device_read_db_internal_filename(device, path); | |
1794 | } | |
1795 | ||
5a937ea2 | 1796 | _public_ int sd_device_get_is_initialized(sd_device *device) { |
57fa1d09 TG |
1797 | int r; |
1798 | ||
1799 | assert_return(device, -EINVAL); | |
57fa1d09 TG |
1800 | |
1801 | r = device_read_db(device); | |
591c186f YW |
1802 | if (r == -ENOENT) |
1803 | /* The device may be already removed or renamed. */ | |
1804 | return false; | |
57fa1d09 TG |
1805 | if (r < 0) |
1806 | return r; | |
1807 | ||
5a937ea2 | 1808 | return device->is_initialized; |
57fa1d09 TG |
1809 | } |
1810 | ||
8626b43b LP |
1811 | _public_ int sd_device_get_usec_initialized(sd_device *device, uint64_t *ret) { |
1812 | int r; | |
1813 | ||
1814 | assert_return(device, -EINVAL); | |
1815 | ||
4eb5f1db | 1816 | r = sd_device_get_is_initialized(device); |
8626b43b LP |
1817 | if (r < 0) |
1818 | return r; | |
4eb5f1db | 1819 | if (r == 0) |
8626b43b LP |
1820 | return -EBUSY; |
1821 | ||
1822 | if (device->usec_initialized == 0) | |
1823 | return -ENODATA; | |
1824 | ||
1825 | if (ret) | |
1826 | *ret = device->usec_initialized; | |
1827 | ||
1828 | return 0; | |
1829 | } | |
1830 | ||
4eb5f1db YW |
1831 | _public_ int sd_device_get_usec_since_initialized(sd_device *device, uint64_t *ret) { |
1832 | usec_t now_ts, ts; | |
57fa1d09 TG |
1833 | int r; |
1834 | ||
1835 | assert_return(device, -EINVAL); | |
57fa1d09 | 1836 | |
4eb5f1db | 1837 | r = sd_device_get_usec_initialized(device, &ts); |
57fa1d09 TG |
1838 | if (r < 0) |
1839 | return r; | |
1840 | ||
02ef01ad | 1841 | now_ts = now(CLOCK_MONOTONIC); |
57fa1d09 | 1842 | |
4eb5f1db | 1843 | if (now_ts < ts) |
57fa1d09 TG |
1844 | return -EIO; |
1845 | ||
4eb5f1db YW |
1846 | if (ret) |
1847 | *ret = usec_sub_unsigned(now_ts, ts); | |
1848 | ||
57fa1d09 TG |
1849 | return 0; |
1850 | } | |
1851 | ||
1852 | _public_ const char *sd_device_get_tag_first(sd_device *device) { | |
8927b1da DH |
1853 | void *v; |
1854 | ||
57fa1d09 TG |
1855 | assert_return(device, NULL); |
1856 | ||
1857 | (void) device_read_db(device); | |
1858 | ||
e77b146f LP |
1859 | device->all_tags_iterator_generation = device->tags_generation; |
1860 | device->all_tags_iterator = ITERATOR_FIRST; | |
57fa1d09 | 1861 | |
e77b146f | 1862 | (void) set_iterate(device->all_tags, &device->all_tags_iterator, &v); |
8927b1da | 1863 | return v; |
57fa1d09 TG |
1864 | } |
1865 | ||
1866 | _public_ const char *sd_device_get_tag_next(sd_device *device) { | |
8927b1da DH |
1867 | void *v; |
1868 | ||
57fa1d09 TG |
1869 | assert_return(device, NULL); |
1870 | ||
1871 | (void) device_read_db(device); | |
1872 | ||
e77b146f LP |
1873 | if (device->all_tags_iterator_generation != device->tags_generation) |
1874 | return NULL; | |
1875 | ||
1876 | (void) set_iterate(device->all_tags, &device->all_tags_iterator, &v); | |
1877 | return v; | |
1878 | } | |
1879 | ||
6ece7cd2 YW |
1880 | static bool device_database_supports_current_tags(sd_device *device) { |
1881 | assert(device); | |
1882 | ||
1883 | (void) device_read_db(device); | |
1884 | ||
1885 | /* The current tags (saved in Q field) feature is implemented in database version 1. | |
1886 | * If the database version is 0, then the tags (NOT current tags, saved in G field) are not | |
1887 | * sticky. Thus, we can safely bypass the operations for the current tags (Q) to tags (G). */ | |
1888 | ||
1889 | return device->database_version >= 1; | |
1890 | } | |
1891 | ||
e77b146f LP |
1892 | _public_ const char *sd_device_get_current_tag_first(sd_device *device) { |
1893 | void *v; | |
1894 | ||
1895 | assert_return(device, NULL); | |
1896 | ||
6ece7cd2 YW |
1897 | if (!device_database_supports_current_tags(device)) |
1898 | return sd_device_get_tag_first(device); | |
1899 | ||
e77b146f LP |
1900 | (void) device_read_db(device); |
1901 | ||
1902 | device->current_tags_iterator_generation = device->tags_generation; | |
1903 | device->current_tags_iterator = ITERATOR_FIRST; | |
1904 | ||
1905 | (void) set_iterate(device->current_tags, &device->current_tags_iterator, &v); | |
1906 | return v; | |
1907 | } | |
1908 | ||
1909 | _public_ const char *sd_device_get_current_tag_next(sd_device *device) { | |
1910 | void *v; | |
1911 | ||
1912 | assert_return(device, NULL); | |
1913 | ||
6ece7cd2 YW |
1914 | if (!device_database_supports_current_tags(device)) |
1915 | return sd_device_get_tag_next(device); | |
1916 | ||
e77b146f LP |
1917 | (void) device_read_db(device); |
1918 | ||
1919 | if (device->current_tags_iterator_generation != device->tags_generation) | |
57fa1d09 TG |
1920 | return NULL; |
1921 | ||
e77b146f | 1922 | (void) set_iterate(device->current_tags, &device->current_tags_iterator, &v); |
8927b1da | 1923 | return v; |
57fa1d09 TG |
1924 | } |
1925 | ||
1926 | _public_ const char *sd_device_get_devlink_first(sd_device *device) { | |
8927b1da DH |
1927 | void *v; |
1928 | ||
57fa1d09 TG |
1929 | assert_return(device, NULL); |
1930 | ||
1931 | (void) device_read_db(device); | |
1932 | ||
1933 | device->devlinks_iterator_generation = device->devlinks_generation; | |
1934 | device->devlinks_iterator = ITERATOR_FIRST; | |
1935 | ||
bccfe92e | 1936 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1937 | return v; |
57fa1d09 TG |
1938 | } |
1939 | ||
1940 | _public_ const char *sd_device_get_devlink_next(sd_device *device) { | |
8927b1da DH |
1941 | void *v; |
1942 | ||
57fa1d09 TG |
1943 | assert_return(device, NULL); |
1944 | ||
1945 | (void) device_read_db(device); | |
1946 | ||
1947 | if (device->devlinks_iterator_generation != device->devlinks_generation) | |
1948 | return NULL; | |
1949 | ||
bccfe92e | 1950 | (void) set_iterate(device->devlinks, &device->devlinks_iterator, &v); |
8927b1da | 1951 | return v; |
57fa1d09 TG |
1952 | } |
1953 | ||
a3ce8136 | 1954 | int device_properties_prepare(sd_device *device) { |
57fa1d09 TG |
1955 | int r; |
1956 | ||
1957 | assert(device); | |
1958 | ||
1959 | r = device_read_uevent_file(device); | |
1960 | if (r < 0) | |
1961 | return r; | |
1962 | ||
1963 | r = device_read_db(device); | |
1964 | if (r < 0) | |
1965 | return r; | |
1966 | ||
1967 | if (device->property_devlinks_outdated) { | |
1d88a271 | 1968 | _cleanup_free_ char *devlinks = NULL; |
57fa1d09 | 1969 | |
8d80f275 | 1970 | r = set_strjoin(device->devlinks, " ", false, &devlinks); |
57fa1d09 TG |
1971 | if (r < 0) |
1972 | return r; | |
1973 | ||
6f3ac0d5 YW |
1974 | if (!isempty(devlinks)) { |
1975 | r = device_add_property_internal(device, "DEVLINKS", devlinks); | |
1976 | if (r < 0) | |
1977 | return r; | |
1978 | } | |
1979 | ||
57fa1d09 TG |
1980 | device->property_devlinks_outdated = false; |
1981 | } | |
1982 | ||
1983 | if (device->property_tags_outdated) { | |
1d88a271 | 1984 | _cleanup_free_ char *tags = NULL; |
57fa1d09 | 1985 | |
8d80f275 | 1986 | r = set_strjoin(device->all_tags, ":", true, &tags); |
6f3ac0d5 YW |
1987 | if (r < 0) |
1988 | return r; | |
57fa1d09 | 1989 | |
6f3ac0d5 | 1990 | if (!isempty(tags)) { |
e77b146f LP |
1991 | r = device_add_property_internal(device, "TAGS", tags); |
1992 | if (r < 0) | |
1993 | return r; | |
1d88a271 | 1994 | } |
57fa1d09 | 1995 | |
6f3ac0d5 | 1996 | tags = mfree(tags); |
8d80f275 | 1997 | r = set_strjoin(device->current_tags, ":", true, &tags); |
6f3ac0d5 YW |
1998 | if (r < 0) |
1999 | return r; | |
e77b146f | 2000 | |
6f3ac0d5 | 2001 | if (!isempty(tags)) { |
e77b146f LP |
2002 | r = device_add_property_internal(device, "CURRENT_TAGS", tags); |
2003 | if (r < 0) | |
2004 | return r; | |
2005 | } | |
57fa1d09 TG |
2006 | |
2007 | device->property_tags_outdated = false; | |
2008 | } | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
2013 | _public_ const char *sd_device_get_property_first(sd_device *device, const char **_value) { | |
2014 | const char *key; | |
57fa1d09 TG |
2015 | int r; |
2016 | ||
2017 | assert_return(device, NULL); | |
2018 | ||
2019 | r = device_properties_prepare(device); | |
2020 | if (r < 0) | |
2021 | return NULL; | |
2022 | ||
2023 | device->properties_iterator_generation = device->properties_generation; | |
2024 | device->properties_iterator = ITERATOR_FIRST; | |
2025 | ||
7b9103a6 | 2026 | (void) ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)_value, (const void**)&key); |
57fa1d09 TG |
2027 | return key; |
2028 | } | |
2029 | ||
2030 | _public_ const char *sd_device_get_property_next(sd_device *device, const char **_value) { | |
2031 | const char *key; | |
57fa1d09 TG |
2032 | int r; |
2033 | ||
2034 | assert_return(device, NULL); | |
2035 | ||
2036 | r = device_properties_prepare(device); | |
2037 | if (r < 0) | |
2038 | return NULL; | |
2039 | ||
2040 | if (device->properties_iterator_generation != device->properties_generation) | |
2041 | return NULL; | |
2042 | ||
7b9103a6 | 2043 | (void) ordered_hashmap_iterate(device->properties, &device->properties_iterator, (void**)_value, (const void**)&key); |
57fa1d09 TG |
2044 | return key; |
2045 | } | |
2046 | ||
4bc9d816 | 2047 | static int device_sysattrs_read_all_internal(sd_device *device, const char *subdir, Set **stack) { |
57fa1d09 | 2048 | _cleanup_closedir_ DIR *dir = NULL; |
57fa1d09 TG |
2049 | int r; |
2050 | ||
4bc9d816 YW |
2051 | assert(device); |
2052 | assert(stack); | |
2053 | ||
62ccd11d YW |
2054 | r = device_opendir(device, subdir, &dir); |
2055 | if (r == -ENOENT && subdir) | |
2056 | return 0; /* Maybe, this is a child device, and is already removed. */ | |
57fa1d09 TG |
2057 | if (r < 0) |
2058 | return r; | |
2059 | ||
5b304c70 YW |
2060 | if (subdir) { |
2061 | if (faccessat(dirfd(dir), "uevent", F_OK, 0) >= 0) | |
2062 | return 0; /* this is a child device, skipping */ | |
2063 | if (errno != ENOENT) { | |
2064 | log_device_debug_errno(device, errno, | |
2065 | "sd-device: Failed to access %s/uevent, ignoring sub-directory %s: %m", | |
2066 | subdir, subdir); | |
2067 | return 0; | |
2068 | } | |
2069 | } | |
57fa1d09 | 2070 | |
c7f0d9e5 | 2071 | FOREACH_DIRENT_ALL(de, dir, return -errno) { |
65c0f14b | 2072 | _cleanup_free_ char *p = NULL; |
57fa1d09 TG |
2073 | struct stat statbuf; |
2074 | ||
c7f0d9e5 | 2075 | if (dot_or_dot_dot(de->d_name)) |
57fa1d09 TG |
2076 | continue; |
2077 | ||
fadcc122 | 2078 | /* only handle symlinks, regular files, and directories */ |
c7f0d9e5 | 2079 | if (!IN_SET(de->d_type, DT_LNK, DT_REG, DT_DIR)) |
fadcc122 YW |
2080 | continue; |
2081 | ||
2082 | if (subdir) { | |
c7f0d9e5 | 2083 | p = path_join(subdir, de->d_name); |
fadcc122 YW |
2084 | if (!p) |
2085 | return -ENOMEM; | |
2086 | } | |
2087 | ||
c7f0d9e5 | 2088 | if (de->d_type == DT_DIR) { |
4bc9d816 YW |
2089 | /* push the sub-directory into the stack, and read it later. */ |
2090 | if (p) | |
2091 | r = set_ensure_consume(stack, &path_hash_ops_free, TAKE_PTR(p)); | |
2092 | else | |
2093 | r = set_put_strdup_full(stack, &path_hash_ops_free, de->d_name); | |
fadcc122 YW |
2094 | if (r < 0) |
2095 | return r; | |
2096 | ||
2097 | continue; | |
2098 | } | |
2099 | ||
65c0f14b | 2100 | if (fstatat(dirfd(dir), de->d_name, &statbuf, AT_SYMLINK_NOFOLLOW) < 0) |
57fa1d09 TG |
2101 | continue; |
2102 | ||
ab218d0b | 2103 | if ((statbuf.st_mode & (S_IRUSR | S_IWUSR)) == 0) |
57fa1d09 TG |
2104 | continue; |
2105 | ||
bc5e8ebb YW |
2106 | if (p) |
2107 | r = set_ensure_consume(&device->sysattrs, &path_hash_ops_free, TAKE_PTR(p)); | |
2108 | else | |
2109 | r = set_put_strdup_full(&device->sysattrs, &path_hash_ops_free, de->d_name); | |
57fa1d09 TG |
2110 | if (r < 0) |
2111 | return r; | |
2112 | } | |
2113 | ||
fadcc122 YW |
2114 | return 0; |
2115 | } | |
2116 | ||
2117 | static int device_sysattrs_read_all(sd_device *device) { | |
4bc9d816 | 2118 | _cleanup_set_free_ Set *stack = NULL; |
fadcc122 YW |
2119 | int r; |
2120 | ||
2121 | assert(device); | |
2122 | ||
2123 | if (device->sysattrs_read) | |
2124 | return 0; | |
2125 | ||
4bc9d816 | 2126 | r = device_sysattrs_read_all_internal(device, NULL, &stack); |
fadcc122 YW |
2127 | if (r < 0) |
2128 | return r; | |
2129 | ||
4bc9d816 YW |
2130 | for (;;) { |
2131 | _cleanup_free_ char *subdir = NULL; | |
2132 | ||
2133 | subdir = set_steal_first(stack); | |
2134 | if (!subdir) | |
2135 | break; | |
2136 | ||
2137 | r = device_sysattrs_read_all_internal(device, subdir, &stack); | |
2138 | if (r < 0) | |
2139 | return r; | |
2140 | } | |
2141 | ||
57fa1d09 TG |
2142 | device->sysattrs_read = true; |
2143 | ||
2144 | return 0; | |
2145 | } | |
2146 | ||
2147 | _public_ const char *sd_device_get_sysattr_first(sd_device *device) { | |
8927b1da | 2148 | void *v; |
57fa1d09 TG |
2149 | int r; |
2150 | ||
2151 | assert_return(device, NULL); | |
2152 | ||
2153 | if (!device->sysattrs_read) { | |
2154 | r = device_sysattrs_read_all(device); | |
2155 | if (r < 0) { | |
2156 | errno = -r; | |
2157 | return NULL; | |
2158 | } | |
2159 | } | |
2160 | ||
2161 | device->sysattrs_iterator = ITERATOR_FIRST; | |
2162 | ||
bccfe92e | 2163 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 2164 | return v; |
57fa1d09 TG |
2165 | } |
2166 | ||
2167 | _public_ const char *sd_device_get_sysattr_next(sd_device *device) { | |
8927b1da DH |
2168 | void *v; |
2169 | ||
57fa1d09 TG |
2170 | assert_return(device, NULL); |
2171 | ||
2172 | if (!device->sysattrs_read) | |
2173 | return NULL; | |
2174 | ||
bccfe92e | 2175 | (void) set_iterate(device->sysattrs, &device->sysattrs_iterator, &v); |
8927b1da | 2176 | return v; |
57fa1d09 TG |
2177 | } |
2178 | ||
2179 | _public_ int sd_device_has_tag(sd_device *device, const char *tag) { | |
2180 | assert_return(device, -EINVAL); | |
2181 | assert_return(tag, -EINVAL); | |
2182 | ||
2183 | (void) device_read_db(device); | |
2184 | ||
e77b146f LP |
2185 | return set_contains(device->all_tags, tag); |
2186 | } | |
2187 | ||
2188 | _public_ int sd_device_has_current_tag(sd_device *device, const char *tag) { | |
2189 | assert_return(device, -EINVAL); | |
2190 | assert_return(tag, -EINVAL); | |
2191 | ||
6ece7cd2 YW |
2192 | if (!device_database_supports_current_tags(device)) |
2193 | return sd_device_has_tag(device, tag); | |
2194 | ||
e77b146f LP |
2195 | (void) device_read_db(device); |
2196 | ||
2197 | return set_contains(device->current_tags, tag); | |
57fa1d09 TG |
2198 | } |
2199 | ||
45e093a9 YW |
2200 | _public_ int sd_device_get_property_value(sd_device *device, const char *key, const char **ret_value) { |
2201 | const char *value; | |
57fa1d09 TG |
2202 | int r; |
2203 | ||
2204 | assert_return(device, -EINVAL); | |
2205 | assert_return(key, -EINVAL); | |
57fa1d09 TG |
2206 | |
2207 | r = device_properties_prepare(device); | |
2208 | if (r < 0) | |
2209 | return r; | |
2210 | ||
2211 | value = ordered_hashmap_get(device->properties, key); | |
2212 | if (!value) | |
2213 | return -ENOENT; | |
2214 | ||
45e093a9 YW |
2215 | if (ret_value) |
2216 | *ret_value = value; | |
57fa1d09 TG |
2217 | return 0; |
2218 | } | |
2219 | ||
15345fc6 YW |
2220 | int device_get_property_bool(sd_device *device, const char *key) { |
2221 | const char *value; | |
2222 | int r; | |
2223 | ||
2224 | assert(device); | |
2225 | assert(key); | |
2226 | ||
2227 | r = sd_device_get_property_value(device, key, &value); | |
2228 | if (r < 0) | |
2229 | return r; | |
2230 | ||
2231 | return parse_boolean(value); | |
2232 | } | |
2233 | ||
eedfef0f YW |
2234 | int device_get_property_int(sd_device *device, const char *key, int *ret) { |
2235 | const char *value; | |
2236 | int r, v; | |
2237 | ||
2238 | assert(device); | |
2239 | assert(key); | |
2240 | ||
2241 | r = sd_device_get_property_value(device, key, &value); | |
2242 | if (r < 0) | |
2243 | return r; | |
2244 | ||
2245 | r = safe_atoi(value, &v); | |
2246 | if (r < 0) | |
2247 | return r; | |
2248 | ||
2249 | if (ret) | |
2250 | *ret = v; | |
2251 | return 0; | |
2252 | } | |
2253 | ||
b485fd93 LP |
2254 | _public_ int sd_device_get_trigger_uuid(sd_device *device, sd_id128_t *ret) { |
2255 | const char *s; | |
2256 | sd_id128_t id; | |
2257 | int r; | |
2258 | ||
2259 | assert_return(device, -EINVAL); | |
2260 | ||
2261 | /* Retrieves the UUID attached to a uevent when triggering it from userspace via | |
2262 | * sd_device_trigger_with_uuid() or an equivalent interface. Returns -ENOENT if the record is not | |
2263 | * caused by a synthetic event and -ENODATA if it was but no UUID was specified */ | |
2264 | ||
2265 | r = sd_device_get_property_value(device, "SYNTH_UUID", &s); | |
2266 | if (r < 0) | |
2267 | return r; | |
2268 | ||
2269 | if (streq(s, "0")) /* SYNTH_UUID=0 is set whenever a device is triggered by userspace without specifying a UUID */ | |
2270 | return -ENODATA; | |
2271 | ||
2272 | r = sd_id128_from_string(s, &id); | |
2273 | if (r < 0) | |
2274 | return r; | |
2275 | ||
2276 | if (ret) | |
2277 | *ret = id; | |
2278 | ||
2279 | return 0; | |
2280 | } | |
2281 | ||
5eb83e90 YW |
2282 | void device_clear_sysattr_cache(sd_device *device) { |
2283 | device->sysattr_values = hashmap_free(device->sysattr_values); | |
2284 | } | |
2285 | ||
18b11379 | 2286 | int device_cache_sysattr_value(sd_device *device, const char *key, char *value) { |
d7ac0952 FS |
2287 | _unused_ _cleanup_free_ char *old_value = NULL; |
2288 | _cleanup_free_ char *new_key = NULL; | |
57fa1d09 TG |
2289 | int r; |
2290 | ||
2291 | assert(device); | |
61c0972d | 2292 | assert(key); |
57fa1d09 | 2293 | |
61c0972d YW |
2294 | /* This takes the reference of the input value. The input value may be NULL. |
2295 | * This replaces the value if it already exists. */ | |
57fa1d09 | 2296 | |
66efcbb1 | 2297 | /* First, remove the old cache entry. So, we do not need to clear cache on error. */ |
61c0972d YW |
2298 | old_value = hashmap_remove2(device->sysattr_values, key, (void **) &new_key); |
2299 | if (!new_key) { | |
2300 | new_key = strdup(key); | |
2301 | if (!new_key) | |
57fa1d09 TG |
2302 | return -ENOMEM; |
2303 | } | |
2304 | ||
8f5a8d7c | 2305 | r = hashmap_ensure_put(&device->sysattr_values, &path_hash_ops_free_free, new_key, value); |
57fa1d09 TG |
2306 | if (r < 0) |
2307 | return r; | |
61c0972d YW |
2308 | |
2309 | TAKE_PTR(new_key); | |
57fa1d09 TG |
2310 | |
2311 | return 0; | |
2312 | } | |
2313 | ||
18b11379 | 2314 | int device_get_cached_sysattr_value(sd_device *device, const char *key, const char **ret_value) { |
b63dd5aa | 2315 | const char *k = NULL, *value; |
57fa1d09 TG |
2316 | |
2317 | assert(device); | |
b63dd5aa | 2318 | assert(key); |
57fa1d09 | 2319 | |
b63dd5aa YW |
2320 | value = hashmap_get2(device->sysattr_values, key, (void **) &k); |
2321 | if (!k) | |
2322 | return -ESTALE; /* We have not read the attribute. */ | |
2323 | if (!value) | |
2324 | return -ENOENT; /* We have looked up the attribute before and it did not exist. */ | |
2325 | if (ret_value) | |
2326 | *ret_value = value; | |
57fa1d09 TG |
2327 | return 0; |
2328 | } | |
2329 | ||
2330 | /* We cache all sysattr lookups. If an attribute does not exist, it is stored | |
2331 | * with a NULL value in the cache, otherwise the returned string is stored */ | |
32a739af | 2332 | _public_ int sd_device_get_sysattr_value(sd_device *device, const char *sysattr, const char **ret_value) { |
8e7e4a73 LP |
2333 | _cleanup_free_ char *value = NULL, *path = NULL; |
2334 | const char *syspath; | |
57fa1d09 TG |
2335 | struct stat statbuf; |
2336 | int r; | |
2337 | ||
2338 | assert_return(device, -EINVAL); | |
2339 | assert_return(sysattr, -EINVAL); | |
2340 | ||
2341 | /* look for possibly already cached result */ | |
b63dd5aa YW |
2342 | r = device_get_cached_sysattr_value(device, sysattr, ret_value); |
2343 | if (r != -ESTALE) | |
2344 | return r; | |
57fa1d09 TG |
2345 | |
2346 | r = sd_device_get_syspath(device, &syspath); | |
2347 | if (r < 0) | |
2348 | return r; | |
2349 | ||
8e7e4a73 LP |
2350 | path = path_join(syspath, sysattr); |
2351 | if (!path) | |
2352 | return -ENOMEM; | |
2353 | ||
e2e40e9a | 2354 | if (lstat(path, &statbuf) < 0) { |
acfc2a1d YW |
2355 | int k; |
2356 | ||
e2e40e9a LP |
2357 | r = -errno; |
2358 | ||
57fa1d09 | 2359 | /* remember that we could not access the sysattr */ |
acfc2a1d YW |
2360 | k = device_cache_sysattr_value(device, sysattr, NULL); |
2361 | if (k < 0) | |
2362 | log_device_debug_errno(device, k, | |
2363 | "sd-device: failed to cache attribute '%s' with NULL, ignoring: %m", | |
2364 | sysattr); | |
57fa1d09 | 2365 | |
acfc2a1d | 2366 | return r; |
57fa1d09 TG |
2367 | } else if (S_ISLNK(statbuf.st_mode)) { |
2368 | /* Some core links return only the last element of the target path, | |
2369 | * these are just values, the paths should not be exposed. */ | |
2370 | if (STR_IN_SET(sysattr, "driver", "subsystem", "module")) { | |
2371 | r = readlink_value(path, &value); | |
2372 | if (r < 0) | |
2373 | return r; | |
2374 | } else | |
2375 | return -EINVAL; | |
163e0a88 | 2376 | } else if (S_ISDIR(statbuf.st_mode)) |
57fa1d09 | 2377 | /* skip directories */ |
163e0a88 YW |
2378 | return -EISDIR; |
2379 | else if (!(statbuf.st_mode & S_IRUSR)) | |
57fa1d09 TG |
2380 | /* skip non-readable files */ |
2381 | return -EPERM; | |
163e0a88 | 2382 | else { |
70160c6e YW |
2383 | size_t size; |
2384 | ||
2385 | /* Read attribute value, Some attributes contain embedded '\0'. So, it is necessary to | |
2386 | * also get the size of the result. See issue #20025. */ | |
2387 | r = read_full_virtual_file(path, &value, &size); | |
57fa1d09 TG |
2388 | if (r < 0) |
2389 | return r; | |
2390 | ||
2391 | /* drop trailing newlines */ | |
70160c6e YW |
2392 | while (size > 0 && strchr(NEWLINE, value[--size])) |
2393 | value[size] = '\0'; | |
57fa1d09 TG |
2394 | } |
2395 | ||
acfc2a1d YW |
2396 | /* Unfortunately, we need to return 'const char*' instead of 'char*'. Hence, failure in caching |
2397 | * sysattr value is critical unlike the other places. */ | |
2a0ebc05 | 2398 | r = device_cache_sysattr_value(device, sysattr, value); |
acfc2a1d YW |
2399 | if (r < 0) { |
2400 | log_device_debug_errno(device, r, | |
2401 | "sd-device: failed to cache attribute '%s' with '%s'%s: %m", | |
2402 | sysattr, value, ret_value ? "" : ", ignoring"); | |
2403 | if (ret_value) | |
2404 | return r; | |
57fa1d09 | 2405 | |
eb18e7b7 YW |
2406 | return 0; |
2407 | } | |
2408 | ||
2409 | if (ret_value) | |
2410 | *ret_value = value; | |
2411 | ||
2412 | TAKE_PTR(value); | |
57fa1d09 TG |
2413 | return 0; |
2414 | } | |
2415 | ||
bb1bc2fc YW |
2416 | int device_get_sysattr_int(sd_device *device, const char *sysattr, int *ret_value) { |
2417 | const char *value; | |
2418 | int r; | |
2419 | ||
2420 | r = sd_device_get_sysattr_value(device, sysattr, &value); | |
2421 | if (r < 0) | |
2422 | return r; | |
2423 | ||
2424 | int v; | |
2425 | r = safe_atoi(value, &v); | |
2426 | if (r < 0) | |
2427 | return log_device_debug_errno(device, r, "Failed to parse '%s' attribute: %m", sysattr); | |
2428 | ||
2429 | if (ret_value) | |
2430 | *ret_value = v; | |
2431 | /* We return "true" if the value is positive. */ | |
2432 | return v > 0; | |
2433 | } | |
2434 | ||
48a511cf ZJS |
2435 | int device_get_sysattr_unsigned(sd_device *device, const char *sysattr, unsigned *ret_value) { |
2436 | const char *value; | |
2437 | int r; | |
2438 | ||
2439 | r = sd_device_get_sysattr_value(device, sysattr, &value); | |
2440 | if (r < 0) | |
2441 | return r; | |
2442 | ||
2443 | unsigned v; | |
2444 | r = safe_atou(value, &v); | |
2445 | if (r < 0) | |
2446 | return log_device_debug_errno(device, r, "Failed to parse '%s' attribute: %m", sysattr); | |
2447 | ||
2448 | if (ret_value) | |
2449 | *ret_value = v; | |
2450 | /* We return "true" if the value is positive. */ | |
2451 | return v > 0; | |
2452 | } | |
2453 | ||
2829fca2 YW |
2454 | int device_get_sysattr_bool(sd_device *device, const char *sysattr) { |
2455 | const char *value; | |
2456 | int r; | |
2457 | ||
2458 | assert(device); | |
2459 | assert(sysattr); | |
2460 | ||
2461 | r = sd_device_get_sysattr_value(device, sysattr, &value); | |
2462 | if (r < 0) | |
2463 | return r; | |
2464 | ||
2465 | return parse_boolean(value); | |
2466 | } | |
2467 | ||
2a0ebc05 | 2468 | static void device_remove_cached_sysattr_value(sd_device *device, const char *_key) { |
57fa1d09 | 2469 | _cleanup_free_ char *key = NULL; |
57fa1d09 TG |
2470 | |
2471 | assert(device); | |
2472 | assert(_key); | |
2473 | ||
2cfb1978 | 2474 | free(hashmap_remove2(device->sysattr_values, _key, (void **) &key)); |
57fa1d09 TG |
2475 | } |
2476 | ||
8aae9a66 | 2477 | _public_ int sd_device_set_sysattr_value(sd_device *device, const char *sysattr, const char *_value) { |
8e7e4a73 LP |
2478 | _cleanup_free_ char *value = NULL, *path = NULL; |
2479 | const char *syspath; | |
7cadbe09 | 2480 | size_t len; |
57fa1d09 TG |
2481 | int r; |
2482 | ||
2483 | assert_return(device, -EINVAL); | |
2484 | assert_return(sysattr, -EINVAL); | |
2485 | ||
2f7a2e39 YW |
2486 | /* Set the attribute and save it in the cache. */ |
2487 | ||
2fe29a46 | 2488 | if (!_value) { |
2f7a2e39 | 2489 | /* If input value is NULL, then clear cache and not write anything. */ |
2a0ebc05 | 2490 | device_remove_cached_sysattr_value(device, sysattr); |
57fa1d09 TG |
2491 | return 0; |
2492 | } | |
2493 | ||
2494 | r = sd_device_get_syspath(device, &syspath); | |
2495 | if (r < 0) | |
2496 | return r; | |
2497 | ||
8e7e4a73 LP |
2498 | path = path_join(syspath, sysattr); |
2499 | if (!path) | |
2500 | return -ENOMEM; | |
2fa4861a | 2501 | |
2fa4861a | 2502 | len = strlen(_value); |
57fa1d09 TG |
2503 | |
2504 | /* drop trailing newlines */ | |
2a394d0b | 2505 | while (len > 0 && strchr(NEWLINE, _value[len - 1])) |
2fa4861a | 2506 | len --; |
57fa1d09 TG |
2507 | |
2508 | /* value length is limited to 4k */ | |
2fa4861a | 2509 | if (len > 4096) |
57fa1d09 TG |
2510 | return -EINVAL; |
2511 | ||
2fa4861a | 2512 | value = strndup(_value, len); |
2fe29a46 TG |
2513 | if (!value) |
2514 | return -ENOMEM; | |
2515 | ||
7cadbe09 YW |
2516 | r = write_string_file(path, value, WRITE_STRING_FILE_DISABLE_BUFFER | WRITE_STRING_FILE_NOFOLLOW); |
2517 | if (r < 0) { | |
23ff570b YW |
2518 | /* On failure, clear cache entry, as we do not know how it fails. */ |
2519 | device_remove_cached_sysattr_value(device, sysattr); | |
2520 | return r; | |
7cadbe09 | 2521 | } |
57fa1d09 | 2522 | |
297d1370 YW |
2523 | /* Do not cache action string written into uevent file. */ |
2524 | if (streq(sysattr, "uevent")) | |
2525 | return 0; | |
2526 | ||
2a0ebc05 | 2527 | r = device_cache_sysattr_value(device, sysattr, value); |
57fa1d09 | 2528 | if (r < 0) |
acfc2a1d YW |
2529 | log_device_debug_errno(device, r, |
2530 | "sd-device: failed to cache attribute '%s' with '%s', ignoring: %m", | |
2531 | sysattr, value); | |
2532 | else | |
2533 | TAKE_PTR(value); | |
2fe29a46 | 2534 | |
57fa1d09 TG |
2535 | return 0; |
2536 | } | |
ea2bc257 YW |
2537 | |
2538 | _public_ int sd_device_set_sysattr_valuef(sd_device *device, const char *sysattr, const char *format, ...) { | |
2539 | _cleanup_free_ char *value = NULL; | |
2540 | va_list ap; | |
2541 | int r; | |
2542 | ||
2543 | assert_return(device, -EINVAL); | |
2544 | assert_return(sysattr, -EINVAL); | |
2545 | ||
2546 | if (!format) { | |
2a0ebc05 | 2547 | device_remove_cached_sysattr_value(device, sysattr); |
ea2bc257 YW |
2548 | return 0; |
2549 | } | |
2550 | ||
2551 | va_start(ap, format); | |
2552 | r = vasprintf(&value, format, ap); | |
2553 | va_end(ap); | |
2554 | ||
2555 | if (r < 0) | |
2556 | return -ENOMEM; | |
2557 | ||
2558 | return sd_device_set_sysattr_value(device, sysattr, value); | |
2559 | } | |
f4d36efa YW |
2560 | |
2561 | _public_ int sd_device_trigger(sd_device *device, sd_device_action_t action) { | |
2562 | const char *s; | |
2563 | ||
2564 | assert_return(device, -EINVAL); | |
2565 | ||
2566 | s = device_action_to_string(action); | |
2567 | if (!s) | |
2568 | return -EINVAL; | |
2569 | ||
b485fd93 | 2570 | /* This uses the simple no-UUID interface of kernel < 4.13 */ |
f4d36efa YW |
2571 | return sd_device_set_sysattr_value(device, "uevent", s); |
2572 | } | |
b485fd93 LP |
2573 | |
2574 | _public_ int sd_device_trigger_with_uuid( | |
2575 | sd_device *device, | |
2576 | sd_device_action_t action, | |
2577 | sd_id128_t *ret_uuid) { | |
2578 | ||
b485fd93 LP |
2579 | const char *s, *j; |
2580 | sd_id128_t u; | |
2581 | int r; | |
2582 | ||
2583 | assert_return(device, -EINVAL); | |
2584 | ||
48008c1c | 2585 | /* If no one wants to know the UUID, use the simple interface from pre-4.13 times */ |
b485fd93 LP |
2586 | if (!ret_uuid) |
2587 | return sd_device_trigger(device, action); | |
2588 | ||
2589 | s = device_action_to_string(action); | |
2590 | if (!s) | |
2591 | return -EINVAL; | |
2592 | ||
2593 | r = sd_id128_randomize(&u); | |
2594 | if (r < 0) | |
2595 | return r; | |
2596 | ||
b7416360 | 2597 | j = strjoina(s, " ", SD_ID128_TO_UUID_STRING(u)); |
b485fd93 LP |
2598 | |
2599 | r = sd_device_set_sysattr_value(device, "uevent", j); | |
2600 | if (r < 0) | |
2601 | return r; | |
2602 | ||
2603 | *ret_uuid = u; | |
2604 | return 0; | |
2605 | } | |
f9a726ab YW |
2606 | |
2607 | _public_ int sd_device_open(sd_device *device, int flags) { | |
254d1313 | 2608 | _cleanup_close_ int fd = -EBADF, fd2 = -EBADF; |
15345fc6 | 2609 | const char *devname, *subsystem = NULL; |
f9a726ab YW |
2610 | uint64_t q, diskseq = 0; |
2611 | struct stat st; | |
2612 | dev_t devnum; | |
2613 | int r; | |
2614 | ||
2615 | assert_return(device, -EINVAL); | |
2616 | assert_return(FLAGS_SET(flags, O_PATH) || !FLAGS_SET(flags, O_NOFOLLOW), -EINVAL); | |
2617 | ||
2618 | r = sd_device_get_devname(device, &devname); | |
2619 | if (r == -ENOENT) | |
2620 | return -ENOEXEC; | |
2621 | if (r < 0) | |
2622 | return r; | |
2623 | ||
2624 | r = sd_device_get_devnum(device, &devnum); | |
2625 | if (r == -ENOENT) | |
2626 | return -ENOEXEC; | |
2627 | if (r < 0) | |
2628 | return r; | |
2629 | ||
2630 | r = sd_device_get_subsystem(device, &subsystem); | |
2631 | if (r < 0 && r != -ENOENT) | |
2632 | return r; | |
2633 | ||
f9a726ab YW |
2634 | fd = open(devname, FLAGS_SET(flags, O_PATH) ? flags : O_CLOEXEC|O_NOFOLLOW|O_PATH); |
2635 | if (fd < 0) | |
2636 | return -errno; | |
2637 | ||
2638 | if (fstat(fd, &st) < 0) | |
2639 | return -errno; | |
2640 | ||
2641 | if (st.st_rdev != devnum) | |
2642 | return -ENXIO; | |
2643 | ||
2644 | if (streq_ptr(subsystem, "block") ? !S_ISBLK(st.st_mode) : !S_ISCHR(st.st_mode)) | |
2645 | return -ENXIO; | |
2646 | ||
2647 | /* If flags has O_PATH, then we cannot check diskseq. Let's return earlier. */ | |
2648 | if (FLAGS_SET(flags, O_PATH)) | |
2649 | return TAKE_FD(fd); | |
2650 | ||
42899bce YW |
2651 | /* If the device is not initialized, then we cannot determine if we should check diskseq through |
2652 | * ID_IGNORE_DISKSEQ property. Let's skip to check diskseq in that case. */ | |
2653 | r = sd_device_get_is_initialized(device); | |
2654 | if (r < 0) | |
03b894fc | 2655 | return r; |
42899bce YW |
2656 | if (r > 0) { |
2657 | r = device_get_property_bool(device, "ID_IGNORE_DISKSEQ"); | |
03b894fc YW |
2658 | if (r < 0 && r != -ENOENT) |
2659 | return r; | |
42899bce YW |
2660 | if (r <= 0) { |
2661 | r = sd_device_get_diskseq(device, &diskseq); | |
2662 | if (r < 0 && r != -ENOENT) | |
2663 | return r; | |
2664 | } | |
03b894fc YW |
2665 | } |
2666 | ||
83b94cf1 | 2667 | fd2 = fd_reopen(fd, flags); |
f9a726ab | 2668 | if (fd2 < 0) |
83b94cf1 | 2669 | return fd2; |
f9a726ab YW |
2670 | |
2671 | if (diskseq == 0) | |
2672 | return TAKE_FD(fd2); | |
2673 | ||
2674 | r = fd_get_diskseq(fd2, &q); | |
2675 | if (r < 0) | |
2676 | return r; | |
2677 | ||
2678 | if (q != diskseq) | |
2679 | return -ENXIO; | |
2680 | ||
2681 | return TAKE_FD(fd2); | |
2682 | } | |
db3049b6 YW |
2683 | |
2684 | int device_opendir(sd_device *device, const char *subdir, DIR **ret) { | |
2685 | _cleanup_closedir_ DIR *d = NULL; | |
2686 | _cleanup_free_ char *path = NULL; | |
2687 | const char *syspath; | |
2688 | int r; | |
2689 | ||
2690 | assert(device); | |
2691 | assert(ret); | |
2692 | ||
2693 | r = sd_device_get_syspath(device, &syspath); | |
2694 | if (r < 0) | |
2695 | return r; | |
2696 | ||
2697 | if (subdir) { | |
2698 | if (!path_is_safe(subdir)) | |
2699 | return -EINVAL; | |
2700 | ||
2701 | path = path_join(syspath, subdir); | |
2702 | if (!path) | |
2703 | return -ENOMEM; | |
2704 | } | |
2705 | ||
2706 | d = opendir(path ?: syspath); | |
2707 | if (!d) | |
2708 | return -errno; | |
2709 | ||
2710 | *ret = TAKE_PTR(d); | |
2711 | return 0; | |
2712 | } |