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https://github.com/systemd/systemd-stable.git
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1aa1e24848
We never used any of the libsysfs convenience features. Here we replace it completely with 300 lines of code, which are much simpler and a bit faster cause udev(d) does not open any syfs file for a simple event which does not need any parent device information. Signed-off-by: Kay Sievers <kay.sievers@suse.de>
400 lines
9.5 KiB
C
400 lines
9.5 KiB
C
/*
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* udevinfo.c - fetches stored device information or sysfs attributes
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*
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* Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stddef.h>
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#include <ctype.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include "udev.h"
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#ifdef USE_LOG
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void log_message (int priority, const char *format, ...)
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{
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va_list args;
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if (priority > udev_log_priority)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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static void print_all_attributes(const char *devpath)
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{
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char path[PATH_SIZE];
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DIR *dir;
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struct dirent *dent;
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strlcpy(path, sysfs_path, sizeof(path));
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strlcat(path, devpath, sizeof(path));
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dir = opendir(path);
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if (dir != NULL) {
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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char *attr_value;
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char value[NAME_SIZE];
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size_t len;
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attr_value = sysfs_attr_get_value(devpath, dent->d_name);
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if (attr_value == NULL)
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continue;
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len = strlcpy(value, attr_value, sizeof(value));
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dbg("attr '%s'='%s'(%zi)", dent->d_name, value, len);
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/* remove trailing newlines */
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while (len && value[len-1] == '\n')
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value[--len] = '\0';
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/* skip nonprintable attributes */
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while (len && isprint(value[len-1]))
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len--;
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if (len) {
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dbg("attribute value of '%s' non-printable, skip", dent->d_name);
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continue;
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}
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replace_untrusted_chars(value);
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printf(" SYSFS{%s}==\"%s\"\n", dent->d_name, value);
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}
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}
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printf("\n");
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}
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static int print_device_chain(const char *devpath)
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{
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struct sysfs_device *dev;
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printf("\n"
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"udevinfo starts with the device the node belongs to and then walks up the\n"
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"device chain, to print for every device found, all possibly useful attributes\n"
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"in the udev key format.\n"
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"Only attributes within one device section may be used together in one rule,\n"
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"to match the device for which the node will be created.\n"
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"\n");
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dev = sysfs_device_get(devpath);
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if (dev == NULL)
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return -1;
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printf(" looking at device '%s':\n", dev->devpath);
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printf(" KERNEL==\"%s\"\n", dev->kernel_name);
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printf(" SUBSYSTEM==\"%s\"\n", dev->subsystem);
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print_all_attributes(dev->devpath);
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/* walk up the chain of devices */
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while (1) {
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dev = sysfs_device_get_parent(dev);
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if (dev == NULL)
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break;
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printf(" looking at device '%s':\n", dev->devpath);
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printf(" ID==\"%s\"\n", dev->kernel_name);
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printf(" BUS==\"%s\"\n", dev->subsystem);
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printf(" DRIVER==\"%s\"\n", dev->driver);
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print_all_attributes(dev->devpath);
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}
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return 0;
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}
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static void print_record(struct udevice *udev)
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{
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struct name_entry *name_loop;
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printf("P: %s\n", udev->dev->devpath);
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printf("N: %s\n", udev->name);
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list_for_each_entry(name_loop, &udev->symlink_list, node)
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printf("S: %s\n", name_loop->name);
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list_for_each_entry(name_loop, &udev->env_list, node)
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printf("E: %s\n", name_loop->name);
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}
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static void export_name_devpath(struct udevice *udev) {
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printf("%s=%s/%s\n", udev->dev->devpath, udev_root, udev->name);
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}
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static void export_record(struct udevice *udev) {
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print_record(udev);
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printf("\n");
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}
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static void export_db(void fnct(struct udevice *udev)) {
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LIST_HEAD(name_list);
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struct name_entry *name_loop;
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udev_db_get_all_entries(&name_list);
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list_for_each_entry(name_loop, &name_list, node) {
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struct udevice *udev_db;
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udev_db = udev_device_init();
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if (udev_db == NULL)
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continue;
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if (udev_db_get_device(udev_db, name_loop->name) == 0)
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fnct(udev_db);
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udev_device_cleanup(udev_db);
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}
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name_list_cleanup(&name_list);
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}
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static void print_help(void)
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{
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fprintf(stderr, "Usage: udevinfo [-anpqrVh]\n"
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" -q TYPE query database for the specified value:\n"
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" 'name' name of device node\n"
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" 'symlink' pointing to node\n"
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" 'path' sysfs device path\n"
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" 'env' the device related imported environment\n"
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" 'all' all values\n"
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"\n"
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" -p PATH sysfs device path used for query or chain\n"
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" -n NAME node/symlink name used for query\n"
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"\n"
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" -r prepend to query result or print udev_root\n"
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" -a print all SYSFS_attributes along the device chain\n"
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" -e export the content of the udev database\n"
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" -V print udev version\n"
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" -h print this help text\n"
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"\n");
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}
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int main(int argc, char *argv[], char *envp[])
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{
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static const char short_options[] = "aden:p:q:rVh";
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int option;
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struct udevice *udev;
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int root = 0;
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enum action_type {
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ACTION_NONE,
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ACTION_QUERY,
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ACTION_ATTRIBUTE_WALK,
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ACTION_ROOT,
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} action = ACTION_NONE;
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enum query_type {
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QUERY_NONE,
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QUERY_NAME,
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QUERY_PATH,
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QUERY_SYMLINK,
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QUERY_ENV,
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QUERY_ALL,
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} query = QUERY_NONE;
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char path[PATH_SIZE] = "";
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char name[PATH_SIZE] = "";
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char temp[PATH_SIZE];
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struct name_entry *name_loop;
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char *pos;
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int rc = 0;
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logging_init("udevinfo");
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udev_config_init();
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sysfs_init();
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udev = udev_device_init();
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if (udev == NULL) {
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rc = 1;
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goto exit;
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}
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/* get command line options */
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while (1) {
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option = getopt(argc, argv, short_options);
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if (option == -1)
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break;
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dbg("option '%c'", option);
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switch (option) {
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case 'n':
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dbg("udev name: %s\n", optarg);
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strlcpy(name, optarg, sizeof(name));
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break;
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case 'p':
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dbg("udev path: %s\n", optarg);
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/* remove sysfs mountpoint if not given */
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if (strncmp(optarg, sysfs_path, strlen(sysfs_path)) == 0)
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strlcpy(path, &optarg[strlen(sysfs_path)], sizeof(path));
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else
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strlcpy(path, optarg, sizeof(path));
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break;
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case 'q':
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dbg("udev query: %s\n", optarg);
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action = ACTION_QUERY;
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if (strcmp(optarg, "name") == 0) {
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query = QUERY_NAME;
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break;
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}
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if (strcmp(optarg, "symlink") == 0) {
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query = QUERY_SYMLINK;
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break;
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}
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if (strcmp(optarg, "path") == 0) {
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query = QUERY_PATH;
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break;
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}
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if (strcmp(optarg, "env") == 0) {
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query = QUERY_ENV;
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break;
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}
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if (strcmp(optarg, "all") == 0) {
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query = QUERY_ALL;
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break;
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}
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fprintf(stderr, "unknown query type\n");
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rc = 2;
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goto exit;
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case 'r':
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if (action == ACTION_NONE)
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action = ACTION_ROOT;
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root = 1;
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break;
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case 'a':
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action = ACTION_ATTRIBUTE_WALK;
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break;
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case 'd':
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export_db(export_name_devpath);
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goto exit;
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case 'e':
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export_db(export_record);
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goto exit;
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case 'V':
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printf("udevinfo, version %s\n", UDEV_VERSION);
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goto exit;
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case 'h':
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case '?':
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default:
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print_help();
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goto exit;
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}
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}
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/* run action */
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switch (action) {
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case ACTION_QUERY:
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/* need devpath or node/symlink name for query */
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if (path[0] != '\0') {
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/* remove sysfs_path if given */
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if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) {
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pos = path + strlen(sysfs_path);
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} else {
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if (path[0] != '/') {
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/* prepend '/' if missing */
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strcpy(temp, "/");
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strlcpy(temp, path, sizeof(temp));
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pos = temp;
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} else {
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pos = path;
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}
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}
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if (udev_db_get_device(udev, pos) != 0) {
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fprintf(stderr, "no record for '%s' in database\n", pos);
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rc = 3;
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goto exit;
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}
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} else if (name[0] != '\0') {
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char devpath[PATH_SIZE];
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int len;
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/* remove udev_root if given */
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len = strlen(udev_root);
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if (strncmp(name, udev_root, len) == 0) {
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pos = &name[len+1];
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} else
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pos = name;
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if (udev_db_lookup_name(pos, devpath, sizeof(devpath)) != 0) {
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fprintf(stderr, "no record for '%s' in database\n", pos);
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rc = 3;
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goto exit;
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}
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udev_db_get_device(udev, devpath);
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} else {
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fprintf(stderr, "query needs device path(-p) or node name(-n) specified\n");
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rc = 4;
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goto exit;
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}
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switch(query) {
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case QUERY_NAME:
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if (root)
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printf("%s/%s\n", udev_root, udev->name);
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else
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printf("%s\n", udev->name);
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break;
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case QUERY_SYMLINK:
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if (list_empty(&udev->symlink_list))
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goto exit;
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if (root)
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list_for_each_entry(name_loop, &udev->symlink_list, node)
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printf("%s/%s ", udev_root, name_loop->name);
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else
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list_for_each_entry(name_loop, &udev->symlink_list, node)
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printf("%s ", name_loop->name);
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printf("\n");
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break;
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case QUERY_PATH:
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printf("%s\n", udev->dev->devpath);
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goto exit;
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case QUERY_ENV:
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list_for_each_entry(name_loop, &udev->env_list, node)
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printf("%s\n", name_loop->name);
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break;
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case QUERY_ALL:
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print_record(udev);
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break;
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default:
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print_help();
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break;
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}
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break;
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case ACTION_ATTRIBUTE_WALK:
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if (path[0] == '\0') {
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fprintf(stderr, "attribute walk on device chain needs path(-p) specified\n");
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rc = 4;
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goto exit;
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} else
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print_device_chain(path);
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break;
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case ACTION_ROOT:
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printf("%s\n", udev_root);
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break;
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default:
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print_help();
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rc = 1;
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break;
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}
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exit:
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udev_device_cleanup(udev);
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sysfs_cleanup();
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logging_close();
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return rc;
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}
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