438 lines
9.2 KiB
C
438 lines
9.2 KiB
C
/*
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* udevinfo - fetches attributes for a device
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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*
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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 <ctype.h>
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#include <stdarg.h>
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#include <unistd.h>
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#include <errno.h>
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#include "libsysfs/sysfs/libsysfs.h"
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#include "libsysfs/dlist.h"
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#include "udev.h"
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#include "udev_version.h"
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#include "logging.h"
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#include "udevdb.h"
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# define SYSFS_VALUE_MAX 200
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char **main_argv;
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int main_argc;
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#ifdef LOG
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unsigned char logname[42];
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void log_message (int level, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vsyslog(level, format, args);
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va_end(args);
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}
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#endif
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static int print_all_attributes(const char *path)
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{
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struct dlist *attributes;
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struct sysfs_attribute *attr;
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struct sysfs_directory *sysfs_dir;
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char value[SYSFS_VALUE_MAX];
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int len;
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int retval = 0;
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sysfs_dir = sysfs_open_directory(path);
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if (sysfs_dir == NULL)
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return -1;
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attributes = sysfs_get_dir_attributes(sysfs_dir);
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if (attributes == NULL) {
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retval = -1;
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goto exit;
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}
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dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
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if (attr->value != NULL) {
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strfieldcpy(value, attr->value);
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len = strlen(value);
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if (len == 0)
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continue;
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/* remove trailing newline */
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if (value[len-1] == '\n') {
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value[len-1] = '\0';
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len--;
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}
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/* skip nonprintable values */
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while (len) {
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if (isprint(value[len-1]) == 0)
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break;
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len--;
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}
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if (len == 0)
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printf(" SYSFS{%s}=\"%s\"\n", attr->name, value);
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}
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}
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printf("\n");
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exit:
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sysfs_close_directory(sysfs_dir);
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return retval;
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}
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/* callback for database dump */
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static int print_record(char *path, struct udevice *dev)
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{
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printf("P: %s\n", path);
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printf("N: %s\n", dev->name);
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printf("M: %#o\n", dev->mode);
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printf("S: %s\n", dev->symlink);
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printf("O: %s\n", dev->owner);
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printf("G: %s\n", dev->group);
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printf("\n");
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return 0;
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}
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enum query_type {
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NONE,
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NAME,
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PATH,
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SYMLINK,
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MODE,
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OWNER,
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GROUP
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};
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static int print_device_chain(const char *path)
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{
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struct sysfs_class_device *class_dev;
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struct sysfs_class_device *class_dev_parent;
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struct sysfs_attribute *attr;
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struct sysfs_device *sysfs_dev;
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struct sysfs_device *sysfs_dev_parent;
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int retval = 0;
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/* get the class dev */
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class_dev = sysfs_open_class_device_path(path);
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if (class_dev == NULL) {
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printf("couldn't get the class device\n");
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return -1;
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}
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/* read the 'dev' file for major/minor*/
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attr = sysfs_get_classdev_attr(class_dev, "dev");
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if (attr == NULL) {
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printf("couldn't get the \"dev\" file\n");
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retval = -1;
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goto exit;
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}
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printf("\ndevice '%s' has major:minor %s", class_dev->path, attr->value);
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sysfs_close_attribute(attr);
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/* open sysfs class device directory and print all attributes */
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printf(" looking at class device '%s':\n", class_dev->path);
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if (print_all_attributes(class_dev->path) != 0) {
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printf("couldn't open class device directory\n");
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retval = -1;
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goto exit;
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}
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/* get the device link (if parent exists look here) */
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class_dev_parent = sysfs_get_classdev_parent(class_dev);
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if (class_dev_parent != NULL) {
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//sysfs_close_class_device(class_dev);
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class_dev = class_dev_parent;
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}
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sysfs_dev = sysfs_get_classdev_device(class_dev);
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if (sysfs_dev != NULL)
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printf("follow the class device's \"device\"\n");
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/* look the device chain upwards */
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while (sysfs_dev != NULL) {
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printf(" looking at the device chain at '%s':\n", sysfs_dev->path);
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printf(" BUS=\"%s\"\n", sysfs_dev->bus);
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printf(" ID=\"%s\"\n", sysfs_dev->bus_id);
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/* open sysfs device directory and print all attributes */
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print_all_attributes(sysfs_dev->path);
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sysfs_dev_parent = sysfs_get_device_parent(sysfs_dev);
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if (sysfs_dev_parent == NULL)
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break;
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//sysfs_close_device(sysfs_dev);
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sysfs_dev = sysfs_dev_parent;
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}
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sysfs_close_device(sysfs_dev);
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exit:
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//sysfs_close_class_device(class_dev);
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return retval;
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}
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static int process_options(void)
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{
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static const char short_options[] = "adn:p:q:rVh";
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int option;
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int retval = 1;
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struct udevice dev;
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int root = 0;
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int attributes = 0;
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enum query_type query = NONE;
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char result[NAME_SIZE] = "";
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char path[NAME_SIZE] = "";
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char name[NAME_SIZE] = "";
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char temp[NAME_SIZE];
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char *pos;
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/* get command line options */
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while (1) {
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option = getopt(main_argc, main_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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strfieldcpy(name, optarg);
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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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strfieldcpy(path, optarg);
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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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if (strcmp(optarg, "name") == 0) {
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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 = SYMLINK;
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break;
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}
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if (strcmp(optarg, "mode") == 0) {
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query = MODE;
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break;
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}
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if (strcmp(optarg, "owner") == 0) {
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query = OWNER;
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break;
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}
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if (strcmp(optarg, "group") == 0) {
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query = GROUP;
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break;
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}
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if (strcmp(optarg, "path") == 0) {
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query = PATH;
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break;
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}
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printf("unknown query type\n");
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exit(1);
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case 'r':
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root = 1;
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break;
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case 'a':
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attributes = 1;
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break;
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case 'd':
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retval = udevdb_open_ro();
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if (retval != 0) {
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printf("unable to open udev database\n");
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exit(2);
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}
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udevdb_call_foreach(print_record);
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udevdb_exit();
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exit(0);
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case 'V':
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printf("udevinfo, version %s\n", UDEV_VERSION);
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exit(0);
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case 'h':
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retval = 0;
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case '?':
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default:
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goto help;
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}
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}
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/* process options */
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if (query != NONE) {
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retval = udevdb_open_ro();
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if (retval != 0) {
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printf("unable to open udev database\n");
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return -EACCES;
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}
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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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strfieldcat(temp, "/");
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strfieldcat(temp, path);
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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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retval = udevdb_get_dev(pos, &dev);
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if (retval != 0) {
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printf("device not found in database\n");
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goto exit;
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}
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goto print;
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}
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if (name[0] != '\0') {
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/* remove udev_root if given */
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if (strncmp(name, udev_root, strlen(udev_root)) == 0) {
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pos = name + strlen(udev_root);
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} else
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pos = name;
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retval = udevdb_get_dev_byname(pos, path, &dev);
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if (retval != 0) {
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printf("device not found in database\n");
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goto exit;
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}
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goto print;
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}
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printf("query needs device path(-p) or node name(-n) specified\n");
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goto exit;
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print:
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switch(query) {
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case NAME:
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if (root)
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strfieldcpy(result, udev_root);
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strfieldcat(result, dev.name);
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break;
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case SYMLINK:
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strfieldcpy(result, dev.symlink);
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break;
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case MODE:
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sprintf(result, "%#o", dev.mode);
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break;
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case GROUP:
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strfieldcpy(result, dev.group);
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break;
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case OWNER:
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strfieldcpy(result, dev.owner);
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break;
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case PATH:
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strfieldcpy(result, path);
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break;
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default:
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goto exit;
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}
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printf("%s\n", result);
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exit:
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udevdb_exit();
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return retval;
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}
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if (attributes) {
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if (path[0] == '\0') {
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printf("attribute walk on device chain needs path(-p) specified\n");
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return -EINVAL;
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} else {
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if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) {
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/* prepend sysfs mountpoint if not given */
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strfieldcpy(temp, path);
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strfieldcpy(path, sysfs_path);
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strfieldcat(path, temp);
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}
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print_device_chain(path);
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return 0;
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}
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}
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if (root) {
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printf("%s\n", udev_root);
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return 0;
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}
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help:
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printf("Usage: [-anpqrdVh]\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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" 'mode' permissions of node\n"
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" 'owner' of node\n"
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" 'group' of node\n"
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" 'path' sysfs device path\n"
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" -p PATH sysfs device path used for query or chain\n"
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" -n NAME node name used for query\n"
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"\n"
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" -r print udev root\n"
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" -a print all SYSFS_attributes along the device chain\n"
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" -d dump whole 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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return retval;
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}
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int main(int argc, char *argv[], char *envp[])
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{
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int retval;
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main_argv = argv;
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main_argc = argc;
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init_logging("udevinfo");
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/* initialize our configuration */
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udev_init_config();
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retval = process_options();
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if (retval != 0)
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exit(1);
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exit(0);
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}
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