146 lines
4.8 KiB
C
146 lines
4.8 KiB
C
/*
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* libudev - interface to udev device information
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*
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* Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "udev.h"
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static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len)
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{
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size_t start;
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/* translate to location of db file */
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util_strlcpy(filename, udev_get_dev_path(udev), len);
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start = util_strlcat(filename, "/.udev/db/", len);
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util_strlcat(filename, devpath, len);
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return util_path_encode(&filename[start], len - start);
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}
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int udev_device_update_db(struct udev_device *udev_device)
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{
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struct udev *udev = udev_device_get_udev(udev_device);
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char filename[UTIL_PATH_SIZE];
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FILE *f;
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char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */
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size_t devlen = strlen(udev_get_dev_path(udev))+1;
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struct udev_list_entry *list_entry;
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int ret;
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devpath_to_db_path(udev,
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udev_device_get_devpath(udev_device),
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filename, sizeof(filename));
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util_create_path(udev, filename);
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unlink(filename);
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udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device))
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if (udev_list_entry_get_flag(list_entry))
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goto file;
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if (udev_device_get_num_fake_partitions(udev_device) != 0)
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goto file;
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if (udev_device_get_ignore_remove(udev_device))
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goto file;
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if (udev_device_get_devlink_priority(udev_device) != 0)
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goto file;
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if (udev_device_get_event_timeout(udev_device) >= 0)
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goto file;
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if (udev_device_get_watch_handle(udev_device) >= 0)
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goto file;
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if (udev_device_get_devnode(udev_device) == NULL)
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goto out;
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/*
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* if we have only the node and symlinks to store, try not to waste
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* tmpfs memory -- store values, if they fit, in a symlink target
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*/
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util_strlcpy(target, &udev_device_get_devnode(udev_device)[devlen], sizeof(target));
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udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) {
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size_t len;
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util_strlcat(target, " ", sizeof(target));
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len = util_strlcat(target, &udev_list_entry_get_name(list_entry)[devlen], sizeof(target));
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if (len >= sizeof(target)) {
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info(udev, "size of links too large, create file\n");
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goto file;
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}
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}
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info(udev, "create db link (%s)\n", target);
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udev_selinux_setfscreatecon(udev, filename, S_IFLNK);
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ret = symlink(target, filename);
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udev_selinux_resetfscreatecon(udev);
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if (ret == 0)
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goto out;
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file:
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f = fopen(filename, "w");
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if (f == NULL) {
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err(udev, "unable to create db file '%s': %m\n", filename);
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return -1;
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}
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info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename);
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if (udev_device_get_devnode(udev_device) != NULL) {
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fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]);
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udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device))
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fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]);
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}
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if (udev_device_get_devlink_priority(udev_device) != 0)
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fprintf(f, "L:%u\n", udev_device_get_devlink_priority(udev_device));
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if (udev_device_get_event_timeout(udev_device) >= 0)
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fprintf(f, "T:%u\n", udev_device_get_event_timeout(udev_device));
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if (udev_device_get_num_fake_partitions(udev_device) != 0)
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fprintf(f, "A:%u\n", udev_device_get_num_fake_partitions(udev_device));
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if (udev_device_get_ignore_remove(udev_device))
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fprintf(f, "R:%u\n", udev_device_get_ignore_remove(udev_device));
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if (udev_device_get_watch_handle(udev_device) >= 0)
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fprintf(f, "W:%u\n", udev_device_get_watch_handle(udev_device));
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udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) {
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if (!udev_list_entry_get_flag(list_entry))
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continue;
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fprintf(f, "E:%s=%s\n",
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udev_list_entry_get_name(list_entry),
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udev_list_entry_get_value(list_entry));
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}
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fclose(f);
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out:
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return 0;
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}
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int udev_device_delete_db(struct udev_device *udev_device)
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{
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char filename[UTIL_PATH_SIZE];
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devpath_to_db_path(udev_device_get_udev(udev_device),
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udev_device_get_devpath(udev_device),
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filename, sizeof(filename));
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unlink(filename);
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return 0;
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}
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int udev_device_rename_db(struct udev_device *udev_device, const char *devpath_old)
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{
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char filename_old[UTIL_PATH_SIZE];
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char filename[UTIL_PATH_SIZE];
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devpath_to_db_path(udev_device_get_udev(udev_device),
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devpath_old,
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filename_old, sizeof(filename_old));
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devpath_to_db_path(udev_device_get_udev(udev_device),
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udev_device_get_devpath(udev_device),
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filename, sizeof(filename));
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return rename(filename_old, filename);
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}
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