src/udev/udev-node.c

	udev-node.c revision 2be7287b0eb88ec7ebc3117e59554c2f6e7ac9e4
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering/*
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * Copyright (C) 2003-2010 Kay Sievers <kay.sievers@vrfy.org>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering *
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * This program is free software: you can redistribute it and/or modify
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * it under the terms of the GNU General Public License as published by
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * the Free Software Foundation, either version 2 of the License, or
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers * (at your option) any later version.
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering *
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * This program is distributed in the hope that it will be useful,
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * but WITHOUT ANY WARRANTY; without even the implied warranty of
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * GNU General Public License for more details.
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering *
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * You should have received a copy of the GNU General Public License
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering * along with this program.  If not, see <http://www.gnu.org/licenses/>.
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <stdlib.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <string.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <stdio.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <stddef.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <stdbool.h>
a9cdc94f7ff40f22a3cf9472f612a80730a1b010Dave Reisner#include <fcntl.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <unistd.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <errno.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <grp.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <dirent.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <sys/time.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <sys/stat.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include <sys/types.h>
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering#include "udev.h"
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers#define TMP_FILE_EXT                ".udev-tmp"
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sieversstatic int node_symlink(struct udev *udev, const char *node, const char *slink)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering{
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        struct stat stats;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        char target[UTIL_PATH_SIZE];
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        char *s;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        size_t l;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        char slink_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)];
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        int i = 0;
0affed79d2e30013f07cb94e6f07e3fcb81c02faLennart Poettering        int tail = 0;
0732ef7acf37473847992888bcb6446726d9d877Zbigniew Jędrzejewski-Szmek        int err = 0;
7568345034f2890af745747783c5abfbf6eccf0fLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /* use relative link */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        target[0] = '\0';
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        while (node[i] && (node[i] == slink[i])) {
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                if (node[i] == '/')
7085053a437456ab87d726f3697002dd811fdf7aDaniel Wallace                        tail = i+1;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                i++;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        s = target;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        l = sizeof(target);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        while (slink[i] != '\0') {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (slink[i] == '/')
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        l = util_strpcpy(&s, l, "../");
1b12a7b5896f94bdf33b3a6661ebabd761ea6adcHarald Hoyer                i++;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        l = util_strscpy(s, l, &node[tail]);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (l == 0) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                err = -EINVAL;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                goto exit;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /* preserve link with correct target, do not replace node of other device */
46e65dcc3a522b5e992e165b5e61d14254026859Lennart Poettering        if (lstat(slink, &stats) == 0) {
46e65dcc3a522b5e992e165b5e61d14254026859Lennart Poettering                if (S_ISBLK(stats.st_mode) || S_ISCHR(stats.st_mode)) {
46e65dcc3a522b5e992e165b5e61d14254026859Lennart Poettering                        log_error("conflicting device node '%s' found, link to '%s' will not be created\n", slink, node);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        goto exit;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                } else if (S_ISLNK(stats.st_mode)) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        char buf[UTIL_PATH_SIZE];
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        int len;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        len = readlink(slink, buf, sizeof(buf));
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        if (len > 0 && len < (int)sizeof(buf)) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                buf[len] = '\0';
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                if (strcmp(target, buf) == 0) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                        log_debug("preserve already existing symlink '%s' to '%s'\n", slink, target);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                        label_fix(slink, true, false);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                        utimensat(AT_FDCWD, slink, NULL, AT_SYMLINK_NOFOLLOW);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                        goto exit;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        } else {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                log_debug("creating symlink '%s' to '%s'\n", slink, target);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                do {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        err = mkdir_parents_label(slink, 0755);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        if (err != 0 && err != -ENOENT)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                break;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        label_context_set(slink, S_IFLNK);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        err = symlink(target, slink);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        if (err != 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                err = -errno;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        label_context_clear();
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                } while (err == -ENOENT);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (err == 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        goto exit;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        log_debug("atomically replace '%s'\n", slink);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        util_strscpyl(slink_tmp, sizeof(slink_tmp), slink, TMP_FILE_EXT, NULL);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        unlink(slink_tmp);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        do {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                err = mkdir_parents_label(slink_tmp, 0755);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (err != 0 && err != -ENOENT)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        break;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                label_context_set(slink_tmp, S_IFLNK);
b92bea5d2a9481de69bb627a7b442a9f58fca43dZbigniew Jędrzejewski-Szmek                err = symlink(target, slink_tmp);
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers                if (err != 0)
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers                        err = -errno;
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers                label_context_clear();
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers        } while (err == -ENOENT);
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers        if (err != 0) {
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers                log_error("symlink '%s' '%s' failed: %m\n", target, slink_tmp);
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers                goto exit;
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers        }
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers        err = rename(slink_tmp, slink);
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sievers        if (err != 0) {
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sievers                log_error("rename '%s' '%s' failed: %m\n", slink_tmp, slink);
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sievers                unlink(slink_tmp);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sieversexit:
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        return err;
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sievers}
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sievers
ffc06c3513d9a0693c7f810d03b20705127ba55aKay Sievers/* find device node of device with highest priority */
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sieversstatic const char *link_find_prioritized(struct udev_device *dev, bool add, const char *stackdir, char *buf, size_t bufsize)
9f6eb1cd58f2ddf2eb6ba0e4de056e13d938af75Kay Sievers{
6046278f405b3ebaf84fcf17f6e834c4c4bd6a42Djalal Harouni        struct udev *udev = udev_device_get_udev(dev);
6046278f405b3ebaf84fcf17f6e834c4c4bd6a42Djalal Harouni        DIR *dir;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        int priority = 0;
6046278f405b3ebaf84fcf17f6e834c4c4bd6a42Djalal Harouni        const char *target = NULL;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (add) {
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                priority = udev_device_get_devlink_priority(dev);
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                util_strscpy(buf, bufsize, udev_device_get_devnode(dev));
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                target = buf;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        dir = opendir(stackdir);
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        if (dir == NULL)
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                return target;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        for (;;) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                struct udev_device *dev_db;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                struct dirent *dent;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                dent = readdir(dir);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (dent == NULL || dent->d_name[0] == '\0')
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        break;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (dent->d_name[0] == '.')
151b9b9662a90455262ce575a8a8ae74bf4ff336Lennart Poettering                        continue;
151b9b9662a90455262ce575a8a8ae74bf4ff336Lennart Poettering
151b9b9662a90455262ce575a8a8ae74bf4ff336Lennart Poettering                log_debug("found '%s' claiming '%s'\n", dent->d_name, stackdir);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                /* did we find ourself? */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (strcmp(dent->d_name, udev_device_get_id_filename(dev)) == 0)
151b9b9662a90455262ce575a8a8ae74bf4ff336Lennart Poettering                        continue;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
94676f3e9352cbf1f72e0a512ee0d2ed83ff676dLennart Poettering                dev_db = udev_device_new_from_id_filename(udev, dent->d_name);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (dev_db != NULL) {
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                        const char *devnode;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
94676f3e9352cbf1f72e0a512ee0d2ed83ff676dLennart Poettering                        devnode = udev_device_get_devnode(dev_db);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        if (devnode != NULL) {
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                                if (target == NULL || udev_device_get_devlink_priority(dev_db) > priority) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                        log_debug("'%s' claims priority %i for '%s'\n",
94676f3e9352cbf1f72e0a512ee0d2ed83ff676dLennart Poettering                                                  udev_device_get_syspath(dev_db), udev_device_get_devlink_priority(dev_db), stackdir);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                        priority = udev_device_get_devlink_priority(dev_db);
c49b30a23583ff39daaa26696bcab478d2fee0bbLennart Poettering                                        util_strscpy(buf, bufsize, devnode);
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                                        target = buf;
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering                                }
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        udev_device_unref(dev_db);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                }
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        closedir(dir);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        return target;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers}
17d33cecaa762f7e43200307328af5e9135e2091Giovanni Campagna
17d33cecaa762f7e43200307328af5e9135e2091Giovanni Campagna/* manage "stack of names" with possibly specified device priorities */
17d33cecaa762f7e43200307328af5e9135e2091Giovanni Campagnastatic void link_update(struct udev_device *dev, const char *slink, bool add)
7568345034f2890af745747783c5abfbf6eccf0fLennart Poettering{
17d33cecaa762f7e43200307328af5e9135e2091Giovanni Campagna        struct udev *udev = udev_device_get_udev(dev);
7568345034f2890af745747783c5abfbf6eccf0fLennart Poettering        char name_enc[UTIL_PATH_SIZE];
7568345034f2890af745747783c5abfbf6eccf0fLennart Poettering        char filename[UTIL_PATH_SIZE * 2];
7568345034f2890af745747783c5abfbf6eccf0fLennart Poettering        char dirname[UTIL_PATH_SIZE];
bac3c8eefe23a820caac930d41629cebafbfc7b2Zbigniew Jędrzejewski-Szmek        const char *target;
7568345034f2890af745747783c5abfbf6eccf0fLennart Poettering        char buf[UTIL_PATH_SIZE];
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        util_path_encode(slink + strlen(TEST_PREFIX "/dev"), name_enc, sizeof(name_enc));
7c2d80944afb4196f2eff614e8da1450dffcbeaaThomas Hindoe Paaboel Andersen        util_strscpyl(dirname, sizeof(dirname), TEST_PREFIX "/run/udev/links/", name_enc, NULL);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        util_strscpyl(filename, sizeof(filename), dirname, "/", udev_device_get_id_filename(dev), NULL);
bac3c8eefe23a820caac930d41629cebafbfc7b2Zbigniew Jędrzejewski-Szmek
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (!add && unlink(filename) == 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                rmdir(dirname);
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        target = link_find_prioritized(dev, add, dirname, buf, sizeof(buf));
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (target == NULL) {
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering                log_debug("no reference left, remove '%s'\n", slink);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (unlink(slink) == 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        util_delete_path(udev, slink);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        } else {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                log_debug("creating link '%s' to '%s'\n", slink, target);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                node_symlink(udev, target, slink);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (add) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                int err;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                do {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        int fd;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        err = mkdir_parents(filename, 0755);
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering                        if (err != 0 && err != -ENOENT)
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering                                break;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        fd = open(filename, O_WRONLY|O_CREAT|O_CLOEXEC|O_TRUNC|O_NOFOLLOW, 0444);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        if (fd >= 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                close(fd);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        else
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                                err = -errno;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                } while (err == -ENOENT);
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        }
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering}
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poetteringvoid udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev_old)
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering{
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        struct udev_list_entry *list_entry;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /* update possible left-over symlinks */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev_old)) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                const char *name = udev_list_entry_get_name(list_entry);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                struct udev_list_entry *list_entry_current;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                int found;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                /* check if old link name still belongs to this device */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                found = 0;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                udev_list_entry_foreach(list_entry_current, udev_device_get_devlinks_list_entry(dev)) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        const char *name_current = udev_list_entry_get_name(list_entry_current);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        if (strcmp(name, name_current) == 0) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                found = 1;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                                break;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                if (found)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        continue;
2b6bf07dd23bb467099d213c97b3875c5e453491Zbigniew Jędrzejewski-Szmek
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                log_debug("update old name, '%s' no longer belonging to '%s'\n",
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                     name, udev_device_get_devpath(dev));
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                link_update(dev, name, 0);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering}
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poetteringstatic int node_fixup(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering{
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        const char *devnode = udev_device_get_devnode(dev);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        dev_t devnum = udev_device_get_devnum(dev);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        struct stat stats;
ef42202ac8ed27e7ff1fc90ef8bc2590046dff25Zbigniew Jędrzejewski-Szmek        int err = 0;
ef42202ac8ed27e7ff1fc90ef8bc2590046dff25Zbigniew Jędrzejewski-Szmek
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (strcmp(udev_device_get_subsystem(dev), "block") == 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                mode |= S_IFBLK;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        else
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                mode |= S_IFCHR;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (lstat(devnode, &stats) != 0) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                err = -errno;
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                log_debug("can not stat() node '%s' (%m)\n", devnode);
7fd1b19bc9e9f5574f2877936b8ac267c7706947Harald Hoyer                goto out;
0732ef7acf37473847992888bcb6446726d9d877Zbigniew Jędrzejewski-Szmek        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
d5099efc47d4e6ac60816b5381a5f607ab03f06eMichal Schmidt        if (((stats.st_mode & S_IFMT) != (mode & S_IFMT)) || (stats.st_rdev != devnum)) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                err = -EEXIST;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                log_debug("found node '%s' with non-matching devnum %s, skip handling\n",
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                          udev_device_get_devnode(dev), udev_device_get_id_filename(dev));
0732ef7acf37473847992888bcb6446726d9d877Zbigniew Jędrzejewski-Szmek                goto out;
0732ef7acf37473847992888bcb6446726d9d877Zbigniew Jędrzejewski-Szmek        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                log_debug("set permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                chmod(devnode, mode);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                chown(devnode, uid, gid);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        } else {
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                log_debug("preserve permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /*
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering         * Set initial selinux file context only on add events.
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering         * We set the proper context on bootup (triger) or for newly
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering         * added devices, but we don't change it later, in case
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering         * something else has set a custom context in the meantime.
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering         */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (strcmp(udev_device_get_action(dev), "add") == 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering            label_fix(devnode, true, false);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
7c2d80944afb4196f2eff614e8da1450dffcbeaaThomas Hindoe Paaboel Andersen        /* always update timestamp when we re-use the node, like on media change events */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        utimensat(AT_FDCWD, devnode, NULL, 0);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poetteringout:
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        return err;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering}
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sieversvoid udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering{
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering        struct udev *udev = udev_device_get_udev(dev);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        char filename[UTIL_PATH_SIZE];
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        struct udev_list_entry *list_entry;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        log_debug("handling device node '%s', devnum=%s, mode=%#o, uid=%d, gid=%d\n",
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                  udev_device_get_devnode(dev), udev_device_get_id_filename(dev), mode, uid, gid);
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        if (node_fixup(dev, mode, uid, gid) < 0)
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                return;
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /* always add /dev/{block,char}/$major:$minor */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        snprintf(filename, sizeof(filename), TEST_PREFIX "/dev/%s/%u:%u",
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                 strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char",
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                 major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        node_symlink(udev, udev_device_get_devnode(dev), filename);
6b2b6f30e38d67b032d6bdc6b47ae05e143e96c5Michal Schmidt
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /* create/update symlinks, add symlinks to name index */
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering        udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) {
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering                if (udev_list_entry_get_num(list_entry))
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        /* simple unmanaged link name */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        node_symlink(udev, udev_device_get_devnode(dev), udev_list_entry_get_name(list_entry));
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                else
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering                        link_update(dev, udev_list_entry_get_name(list_entry), 1);
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers        }
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering}
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sieversvoid udev_node_remove(struct udev_device *dev)
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering{
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering        struct udev_list_entry *list_entry;
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering        char filename[UTIL_PATH_SIZE];
e1636421f46db6d06fbd028ef20a3113fa3e11f8Lennart Poettering
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        /* remove/update symlinks, remove symlinks from name index */
2087a7aff26ea5d1bc2c7c29add3275328f36baaLennart Poettering        udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev))
4d7859d173282e16bb75254c2b4ec14a915ef30bKay Sievers                link_update(dev, udev_list_entry_get_name(list_entry), 0);
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering
7fd1b19bc9e9f5574f2877936b8ac267c7706947Harald Hoyer        /* remove /dev/{block,char}/$major:$minor */
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering        snprintf(filename, sizeof(filename), TEST_PREFIX "/dev/%s/%u:%u",
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering                 strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char",
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering                 major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev)));
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering        unlink(filename);
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering}
50cfc579280fb42569488079bd2e249e32a27df2Lennart Poettering