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Commit | Line | Data |
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ea733a2f GKH |
1 | /* |
2 | * udev-add.c | |
3 | * | |
4 | * Userspace devfs | |
5 | * | |
6 | * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com> | |
7 | * | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the | |
11 | * Free Software Foundation version 2 of the License. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License along | |
19 | * with this program; if not, write to the Free Software Foundation, Inc., | |
20 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <stdlib.h> | |
25 | #include <string.h> | |
26 | #include <stdio.h> | |
27 | #include <fcntl.h> | |
28 | #include <unistd.h> | |
29 | #include <errno.h> | |
32ff5bca | 30 | #include <sys/stat.h> |
10950dfe GKH |
31 | #include <sys/types.h> |
32 | #include <grp.h> | |
f61d732a KS |
33 | #include <net/if.h> |
34 | #include <sys/socket.h> | |
35 | #include <sys/ioctl.h> | |
36 | #include <linux/sockios.h> | |
10950dfe | 37 | #include <pwd.h> |
ea733a2f | 38 | |
c80da508 | 39 | #include "libsysfs/sysfs/libsysfs.h" |
ea733a2f | 40 | #include "udev.h" |
9af5bb2f | 41 | #include "udev_utils.h" |
ea733a2f | 42 | #include "udev_version.h" |
54988802 | 43 | #include "logging.h" |
ea733a2f | 44 | #include "namedev.h" |
02fa9ae5 | 45 | #include "udev_db.h" |
fbda4a34 | 46 | #include "udev_selinux.h" |
9825617b | 47 | |
707680b1 KS |
48 | /* |
49 | * the major/minor of a device is stored in a file called "dev" | |
50 | * The number is stored in decimal values in the format: M:m | |
ea733a2f | 51 | */ |
30defadd | 52 | static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev) |
ea733a2f | 53 | { |
5d4754f1 | 54 | struct sysfs_attribute *attr = NULL; |
ea733a2f | 55 | |
5d4754f1 DS |
56 | attr = sysfs_get_classdev_attr(class_dev, "dev"); |
57 | if (attr == NULL) | |
bbbe503e | 58 | goto error; |
5d4754f1 | 59 | dbg("dev='%s'", attr->value); |
ea733a2f | 60 | |
5d4754f1 | 61 | if (sscanf(attr->value, "%u:%u", &udev->major, &udev->minor) != 2) |
bbbe503e | 62 | goto error; |
f7b4eca4 | 63 | dbg("found major=%d, minor=%d", udev->major, udev->minor); |
ea733a2f | 64 | |
bbbe503e KS |
65 | return 0; |
66 | error: | |
67 | return -1; | |
ea733a2f GKH |
68 | } |
69 | ||
c1ab0461 | 70 | int udev_make_node(struct udevice *udev, const char *file, int major, int minor, mode_t mode, uid_t uid, gid_t gid) |
50e5de03 | 71 | { |
49747bdc KS |
72 | struct stat stats; |
73 | int retval = 0; | |
74 | ||
75 | if (stat(file, &stats) != 0) | |
76 | goto create; | |
77 | ||
78 | /* preserve node with already correct numbers, to not change the inode number */ | |
79 | if (((stats.st_mode & S_IFMT) == S_IFBLK || (stats.st_mode & S_IFMT) == S_IFCHR) && | |
80 | (stats.st_rdev == makedev(major, minor))) { | |
81 | dbg("preserve file '%s', cause it has correct dev_t", file); | |
fbda4a34 | 82 | selinux_setfilecon(file, udev->kernel_name, stats.st_mode); |
49747bdc KS |
83 | goto perms; |
84 | } | |
85 | ||
86 | if (unlink(file) != 0) | |
87 | dbg("unlink(%s) failed with error '%s'", file, strerror(errno)); | |
88 | else | |
89 | dbg("already present file '%s' unlinked", file); | |
50e5de03 | 90 | |
49747bdc | 91 | create: |
fbda4a34 | 92 | selinux_setfscreatecon(file, udev->kernel_name, mode); |
49747bdc | 93 | retval = mknod(file, mode, makedev(major, minor)); |
50e5de03 KS |
94 | if (retval != 0) { |
95 | dbg("mknod(%s, %#o, %u, %u) failed with error '%s'", | |
49747bdc | 96 | file, mode, major, minor, strerror(errno)); |
bbbe503e | 97 | goto exit; |
50e5de03 KS |
98 | } |
99 | ||
49747bdc KS |
100 | perms: |
101 | dbg("chmod(%s, %#o)", file, mode); | |
102 | if (chmod(file, mode) != 0) { | |
103 | dbg("chmod(%s, %#o) failed with error '%s'", file, mode, strerror(errno)); | |
bbbe503e | 104 | goto exit; |
50e5de03 KS |
105 | } |
106 | ||
107 | if (uid != 0 || gid != 0) { | |
49747bdc KS |
108 | dbg("chown(%s, %u, %u)", file, uid, gid); |
109 | if (chown(file, uid, gid) != 0) { | |
50e5de03 | 110 | dbg("chown(%s, %u, %u) failed with error '%s'", |
49747bdc | 111 | file, uid, gid, strerror(errno)); |
bbbe503e | 112 | goto exit; |
50e5de03 KS |
113 | } |
114 | } | |
115 | ||
bbbe503e KS |
116 | exit: |
117 | return retval; | |
50e5de03 KS |
118 | } |
119 | ||
6d564166 | 120 | static int create_node(struct udevice *udev, struct sysfs_class_device *class_dev) |
97853b4f | 121 | { |
9fe3f9a9 | 122 | char filename[NAME_SIZE]; |
9fe3f9a9 | 123 | char partitionname[NAME_SIZE]; |
e308ebb7 GKH |
124 | uid_t uid = 0; |
125 | gid_t gid = 0; | |
3d150dfb | 126 | int tail; |
ef672b3d KS |
127 | char *pos; |
128 | int len; | |
6d564166 | 129 | int i; |
3d150dfb | 130 | |
8673dcb8 | 131 | snprintf(filename, NAME_SIZE, "%s/%s", udev_root, udev->name); |
2b41e68a | 132 | filename[NAME_SIZE-1] = '\0'; |
5840bc63 | 133 | |
7a947ce5 | 134 | switch (udev->type) { |
1331c889 | 135 | case 'b': |
7a947ce5 | 136 | udev->mode |= S_IFBLK; |
1331c889 GKH |
137 | break; |
138 | case 'c': | |
139 | case 'u': | |
7a947ce5 | 140 | udev->mode |= S_IFCHR; |
1331c889 GKH |
141 | break; |
142 | case 'p': | |
7a947ce5 | 143 | udev->mode |= S_IFIFO; |
1331c889 GKH |
144 | break; |
145 | default: | |
7a947ce5 | 146 | dbg("unknown node type %c\n", udev->type); |
1331c889 GKH |
147 | return -EINVAL; |
148 | } | |
0abf54fc | 149 | |
3d150dfb | 150 | /* create parent directories if needed */ |
7a947ce5 | 151 | if (strrchr(udev->name, '/')) |
3d150dfb | 152 | create_path(filename); |
218eae87 | 153 | |
7a947ce5 | 154 | if (udev->owner[0] != '\0') { |
c19a6b30 | 155 | char *endptr; |
7a947ce5 | 156 | unsigned long id = strtoul(udev->owner, &endptr, 10); |
6d564166 | 157 | |
765cbd97 | 158 | if (endptr[0] == '\0') |
c19a6b30 | 159 | uid = (uid_t) id; |
10950dfe | 160 | else { |
5895eb31 | 161 | struct passwd *pw; |
534c853d | 162 | |
7a947ce5 | 163 | pw = getpwnam(udev->owner); |
765cbd97 | 164 | if (pw == NULL) |
7a947ce5 | 165 | dbg("specified user unknown '%s'", udev->owner); |
10950dfe GKH |
166 | else |
167 | uid = pw->pw_uid; | |
168 | } | |
c19a6b30 KS |
169 | } |
170 | ||
7a947ce5 | 171 | if (udev->group[0] != '\0') { |
c19a6b30 | 172 | char *endptr; |
7a947ce5 | 173 | unsigned long id = strtoul(udev->group, &endptr, 10); |
6d564166 | 174 | |
765cbd97 | 175 | if (endptr[0] == '\0') |
c19a6b30 | 176 | gid = (gid_t) id; |
10950dfe | 177 | else { |
7a947ce5 | 178 | struct group *gr = getgrnam(udev->group); |
765cbd97 | 179 | if (gr == NULL) |
7a947ce5 | 180 | dbg("specified group unknown '%s'", udev->group); |
10950dfe GKH |
181 | else |
182 | gid = gr->gr_gid; | |
183 | } | |
c19a6b30 KS |
184 | } |
185 | ||
7a947ce5 | 186 | if (!udev->test_run) { |
50e5de03 | 187 | info("creating device node '%s'", filename); |
c1ab0461 | 188 | if (udev_make_node(udev, filename, udev->major, udev->minor, udev->mode, uid, gid) != 0) |
bbbe503e | 189 | goto error; |
ab2e5bd9 GKH |
190 | } else { |
191 | info("creating device node '%s', major = '%d', minor = '%d', " | |
192 | "mode = '%#o', uid = '%d', gid = '%d'", filename, | |
65ab1334 | 193 | udev->major, udev->minor, udev->mode, uid, gid); |
ab2e5bd9 | 194 | } |
50e5de03 | 195 | |
bbbe503e | 196 | /* create all_partitions if requested */ |
7a947ce5 | 197 | if (udev->partitions > 0) { |
6d564166 KS |
198 | struct sysfs_attribute *attr; |
199 | int range; | |
200 | ||
201 | /* take the maximum registered minor range */ | |
202 | attr = sysfs_get_classdev_attr(class_dev, "range"); | |
203 | if (attr) { | |
204 | range = atoi(attr->value); | |
205 | if (range > 1) | |
206 | udev->partitions = range-1; | |
207 | } | |
7a947ce5 KS |
208 | info("creating device partition nodes '%s[1-%i]'", filename, udev->partitions); |
209 | if (!udev->test_run) { | |
210 | for (i = 1; i <= udev->partitions; i++) { | |
c58e36c0 KS |
211 | strfieldcpy(partitionname, filename); |
212 | strintcat(partitionname, i); | |
c1ab0461 | 213 | udev_make_node(udev, partitionname, udev->major, udev->minor + i, udev->mode, uid, gid); |
ab2e5bd9 | 214 | } |
50e5de03 | 215 | } |
3d150dfb KS |
216 | } |
217 | ||
bbbe503e | 218 | /* create symlink(s) if requested */ |
7a947ce5 | 219 | foreach_strpart(udev->symlink, " ", pos, len) { |
2b41e68a KS |
220 | char linkname[NAME_SIZE]; |
221 | char linktarget[NAME_SIZE]; | |
222 | ||
17794d77 | 223 | strfieldcpymax(linkname, pos, len+1); |
8673dcb8 | 224 | snprintf(filename, NAME_SIZE, "%s/%s", udev_root, linkname); |
2b41e68a KS |
225 | filename[NAME_SIZE-1] = '\0'; |
226 | ||
7a947ce5 KS |
227 | dbg("symlink '%s' to node '%s' requested", filename, udev->name); |
228 | if (!udev->test_run) | |
9fe3f9a9 KS |
229 | if (strrchr(linkname, '/')) |
230 | create_path(filename); | |
231 | ||
232 | /* optimize relative link */ | |
233 | linktarget[0] = '\0'; | |
234 | i = 0; | |
235 | tail = 0; | |
7a947ce5 KS |
236 | while ((udev->name[i] == linkname[i]) && udev->name[i]) { |
237 | if (udev->name[i] == '/') | |
9fe3f9a9 KS |
238 | tail = i+1; |
239 | i++; | |
240 | } | |
241 | while (linkname[i] != '\0') { | |
242 | if (linkname[i] == '/') | |
243 | strfieldcat(linktarget, "../"); | |
244 | i++; | |
245 | } | |
3d150dfb | 246 | |
7a947ce5 | 247 | strfieldcat(linktarget, &udev->name[tail]); |
3d150dfb | 248 | |
9fe3f9a9 | 249 | dbg("symlink(%s, %s)", linktarget, filename); |
7a947ce5 | 250 | if (!udev->test_run) { |
fbda4a34 | 251 | selinux_setfscreatecon(filename, udev->kernel_name, S_IFLNK); |
49747bdc | 252 | unlink(filename); |
bbbe503e | 253 | if (symlink(linktarget, filename) != 0) |
9fe3f9a9 KS |
254 | dbg("symlink(%s, %s) failed with error '%s'", |
255 | linktarget, filename, strerror(errno)); | |
4763256c | 256 | } |
c19a6b30 KS |
257 | } |
258 | ||
bbbe503e KS |
259 | return 0; |
260 | error: | |
261 | return -1; | |
ea733a2f GKH |
262 | } |
263 | ||
7a947ce5 | 264 | static int rename_net_if(struct udevice *udev) |
f61d732a KS |
265 | { |
266 | int sk; | |
267 | struct ifreq ifr; | |
268 | int retval; | |
269 | ||
7a947ce5 KS |
270 | dbg("changing net interface name from '%s' to '%s'", udev->kernel_name, udev->name); |
271 | if (udev->test_run) | |
bbbe503e KS |
272 | return 0; |
273 | ||
f61d732a KS |
274 | sk = socket(PF_INET, SOCK_DGRAM, 0); |
275 | if (sk < 0) { | |
276 | dbg("error opening socket"); | |
277 | return -1; | |
278 | } | |
279 | ||
280 | memset(&ifr, 0x00, sizeof(struct ifreq)); | |
7a947ce5 KS |
281 | strfieldcpy(ifr.ifr_name, udev->kernel_name); |
282 | strfieldcpy(ifr.ifr_newname, udev->name); | |
f61d732a | 283 | |
f61d732a KS |
284 | retval = ioctl(sk, SIOCSIFNAME, &ifr); |
285 | if (retval != 0) | |
286 | dbg("error changing net interface name"); | |
4a539daf | 287 | close(sk); |
f61d732a KS |
288 | |
289 | return retval; | |
290 | } | |
291 | ||
7a947ce5 | 292 | int udev_add_device(struct udevice *udev, struct sysfs_class_device *class_dev) |
ea733a2f | 293 | { |
bbbe503e | 294 | char *pos; |
707680b1 | 295 | int retval = 0; |
ea733a2f | 296 | |
7a947ce5 KS |
297 | if (udev->type == 'b' || udev->type == 'c') { |
298 | retval = get_major_minor(class_dev, udev); | |
f61d732a | 299 | if (retval != 0) { |
707680b1 | 300 | dbg("no dev-file found, do nothing"); |
5d24c6ca | 301 | return 0; |
f61d732a | 302 | } |
ea733a2f GKH |
303 | } |
304 | ||
7a947ce5 | 305 | if (namedev_name_device(udev, class_dev) != 0) |
85a953c0 | 306 | return 0; |
30defadd | 307 | |
7a947ce5 | 308 | dbg("adding name='%s'", udev->name); |
bbbe503e | 309 | |
9825617b | 310 | selinux_init(); |
5d24c6ca KS |
311 | |
312 | if (udev->type == 'b' || udev->type == 'c') { | |
6d564166 | 313 | retval = create_node(udev, class_dev); |
c4603a07 | 314 | if (retval != 0) |
bbbe503e | 315 | goto exit; |
9b28a52a | 316 | |
02fa9ae5 KS |
317 | if (udev_db_add_device(udev) != 0) |
318 | dbg("udev_db_add_dev failed, but we create the node anyway, " | |
5d24c6ca | 319 | "remove might not work for custom names"); |
f61d732a | 320 | |
5d24c6ca | 321 | /* use full path to the environment */ |
8673dcb8 | 322 | snprintf(udev->devname, NAME_SIZE, "%s/%s", udev_root, udev->name); |
2b41e68a | 323 | udev->devname[NAME_SIZE-1] = '\0'; |
5d24c6ca KS |
324 | |
325 | } else if (udev->type == 'n') { | |
326 | /* look if we want to change the name of the netif */ | |
7a947ce5 KS |
327 | if (strcmp(udev->name, udev->kernel_name) != 0) { |
328 | retval = rename_net_if(udev); | |
c4603a07 | 329 | if (retval != 0) |
bbbe503e | 330 | goto exit; |
5d24c6ca | 331 | |
eabfc973 KS |
332 | /* we've changed the name, now fake the devpath, cause the |
333 | * original kernel name sleeps with the fishes and we don't | |
334 | * get an event from the kernel with the new name | |
bbbe503e | 335 | */ |
7a947ce5 | 336 | pos = strrchr(udev->devpath, '/'); |
bbbe503e KS |
337 | if (pos != NULL) { |
338 | pos[1] = '\0'; | |
7a947ce5 | 339 | strfieldcat(udev->devpath, udev->name); |
5d24c6ca | 340 | setenv("DEVPATH", udev->devpath, 1); |
eabfc973 | 341 | setenv("INTERFACE", udev->name, 1); |
bbbe503e | 342 | } |
9b28a52a | 343 | |
5d24c6ca KS |
344 | /* use netif name for the environment */ |
345 | strfieldcpy(udev->devname, udev->name); | |
346 | } | |
f61d732a | 347 | } |
ea733a2f GKH |
348 | |
349 | exit: | |
9825617b | 350 | selinux_restore(); |
30defadd | 351 | |
ea733a2f GKH |
352 | return retval; |
353 | } |