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systemd/udevinfo.c

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/*
* udevinfo - fetches attributes for a device
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
*
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <stdarg.h>
#include <unistd.h>
#include <errno.h>
#include "udev.h"
#include "udev_version.h"
#include "logging.h"
#include "udevdb.h"
#include "libsysfs/libsysfs.h"
# define SYSFS_VALUE_MAX 200
char **main_argv;
int main_argc;
#ifdef LOG
unsigned char logname[42];
void log_message (int level, const char *format, ...)
{
va_list args;
va_start(args, format);
vsyslog(level, format, args);
va_end(args);
}
#endif
static int print_all_attributes(const char *path)
{
struct dlist *attributes;
struct sysfs_attribute *attr;
struct sysfs_directory *sysfs_dir;
char value[SYSFS_VALUE_MAX];
int len;
int retval = 0;
sysfs_dir = sysfs_open_directory(path);
if (sysfs_dir == NULL)
return -1;
attributes = sysfs_get_dir_attributes(sysfs_dir);
if (attributes == NULL) {
retval = -1;
goto exit;
}
dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
if (attr->value != NULL) {
strncpy(value, attr->value, SYSFS_VALUE_MAX);
len = strlen(value);
if (len == 0)
continue;
/* remove trailing newline */
if (value[len-1] == '\n') {
value[len-1] = '\0';
len--;
}
/* skip nonprintable values */
while (len) {
if (isprint(value[len-1]) == 0)
break;
len--;
}
if (len == 0)
printf(" SYSFS_%s=\"%s\"\n", attr->name, value);
}
}
printf("\n");
exit:
sysfs_close_directory(sysfs_dir);
return retval;
}
/* callback for database dump */
static int print_record(char *path, struct udevice *dev)
{
printf("P: %s\n", path);
printf("N: %s\n", dev->name);
printf("M: %#o\n", dev->mode);
printf("S: %s\n", dev->symlink);
printf("O: %s\n", dev->owner);
printf("G: %s\n", dev->group);
printf("\n");
return 0;
}
enum query_type {
NONE,
NAME,
PATH,
SYMLINK,
MODE,
OWNER,
GROUP
};
static int print_device_chain(const char *path)
{
struct sysfs_class_device *class_dev;
struct sysfs_class_device *class_dev_parent;
struct sysfs_attribute *attr;
struct sysfs_device *sysfs_dev;
struct sysfs_device *sysfs_dev_parent;
int retval = 0;
/* get the class dev */
class_dev = sysfs_open_class_device_path(path);
if (class_dev == NULL) {
printf("couldn't get the class device\n");
return -1;
}
/* read the 'dev' file for major/minor*/
attr = sysfs_get_classdev_attr(class_dev, "dev");
if (attr == NULL) {
printf("couldn't get the \"dev\" file\n");
retval = -1;
goto exit;
}
printf("\ndevice '%s' has major:minor %s", class_dev->path, attr->value);
sysfs_close_attribute(attr);
/* open sysfs class device directory and print all attributes */
printf(" looking at class device '%s':\n", class_dev->path);
if (print_all_attributes(class_dev->path) != 0) {
printf("couldn't open class device directory\n");
retval = -1;
goto exit;
}
/* get the device link (if parent exists look here) */
class_dev_parent = sysfs_get_classdev_parent(class_dev);
if (class_dev_parent != NULL) {
//sysfs_close_class_device(class_dev);
class_dev = class_dev_parent;
}
sysfs_dev = sysfs_get_classdev_device(class_dev);
if (sysfs_dev != NULL)
printf("follow the class device's \"device\"\n");
/* look the device chain upwards */
while (sysfs_dev != NULL) {
printf(" looking at the device chain at '%s':\n", sysfs_dev->path);
printf(" BUS=\"%s\"\n", sysfs_dev->bus);
printf(" ID=\"%s\"\n", sysfs_dev->bus_id);
/* open sysfs device directory and print all attributes */
print_all_attributes(sysfs_dev->path);
sysfs_dev_parent = sysfs_get_device_parent(sysfs_dev);
if (sysfs_dev_parent == NULL)
break;
//sysfs_close_device(sysfs_dev);
sysfs_dev = sysfs_dev_parent;
}
sysfs_close_device(sysfs_dev);
exit:
//sysfs_close_class_device(class_dev);
return retval;
}
static int process_options(void)
{
static const char short_options[] = "adn:p:q:rVh";
int option;
int retval = 1;
struct udevice dev;
int root = 0;
int attributes = 0;
enum query_type query = NONE;
char result[NAME_SIZE] = "";
char path[NAME_SIZE] = "";
char name[NAME_SIZE] = "";
char temp[NAME_SIZE];
char *pos;
/* get command line options */
while (1) {
option = getopt(main_argc, main_argv, short_options);
if (option == -1)
break;
dbg("option '%c'", option);
switch (option) {
case 'n':
dbg("udev name: %s\n", optarg);
strfieldcpy(name, optarg);
break;
case 'p':
dbg("udev path: %s\n", optarg);
strfieldcpy(path, optarg);
break;
case 'q':
dbg("udev query: %s\n", optarg);
if (strcmp(optarg, "name") == 0) {
query = NAME;
break;
}
if (strcmp(optarg, "symlink") == 0) {
query = SYMLINK;
break;
}
if (strcmp(optarg, "mode") == 0) {
query = MODE;
break;
}
if (strcmp(optarg, "owner") == 0) {
query = OWNER;
break;
}
if (strcmp(optarg, "group") == 0) {
query = GROUP;
break;
}
if (strcmp(optarg, "path") == 0) {
query = PATH;
break;
}
printf("unknown query type\n");
exit(1);
case 'r':
root = 1;
break;
case 'a':
attributes = 1;
break;
case 'd':
retval = udevdb_open_ro();
if (retval != 0) {
printf("unable to open udev database\n");
exit(2);
}
udevdb_call_foreach(print_record);
udevdb_exit();
exit(0);
case 'V':
printf("udevinfo, version %s\n", UDEV_VERSION);
exit(0);
case 'h':
retval = 0;
case '?':
default:
goto help;
}
}
/* process options */
if (query != NONE) {
retval = udevdb_open_ro();
if (retval != 0) {
printf("unable to open udev database\n");
return -EACCES;
}
if (path[0] != '\0') {
/* remove sysfs_path if given */
if (strncmp(path, sysfs_path, strlen(sysfs_path)) == 0) {
pos = path + strlen(sysfs_path);
} else {
if (path[0] != '/') {
/* prepend '/' if missing */
strcat(temp, "/");
strncat(temp, path, sizeof(path));
pos = temp;
} else {
pos = path;
}
}
retval = udevdb_get_dev(pos, &dev);
if (retval != 0) {
printf("device not found in database\n");
goto exit;
}
goto print;
}
if (name[0] != '\0') {
/* remove udev_root if given */
if (strncmp(name, udev_root, strlen(udev_root)) == 0) {
pos = name + strlen(udev_root);
} else
pos = name;
retval = udevdb_get_dev_byname(pos, path, &dev);
if (retval != 0) {
printf("device not found in database\n");
goto exit;
}
goto print;
}
printf("query needs device path(-p) or node name(-n) specified\n");
goto exit;
print:
switch(query) {
case NAME:
if (root)
strfieldcpy(result, udev_root);
strncat(result, dev.name, sizeof(result));
break;
case SYMLINK:
strfieldcpy(result, dev.symlink);
break;
case MODE:
sprintf(result, "%#o", dev.mode);
break;
case GROUP:
strfieldcpy(result, dev.group);
break;
case OWNER:
strfieldcpy(result, dev.owner);
break;
case PATH:
strfieldcpy(result, path);
break;
default:
goto exit;
}
printf("%s\n", result);
exit:
udevdb_exit();
return retval;
}
if (attributes) {
if (path[0] == '\0') {
printf("attribute walk on device chain needs path(-p) specified\n");
return -EINVAL;
} else {
if (strncmp(path, sysfs_path, strlen(sysfs_path)) != 0) {
/* prepend sysfs mountpoint if not given */
strfieldcpy(temp, path);
strfieldcpy(path, sysfs_path);
strncat(path, temp, sizeof(path));
}
print_device_chain(path);
return 0;
}
}
if (root) {
printf("%s\n", udev_root);
return 0;
}
help:
printf("Usage: [-anpqrdVh]\n"
" -q TYPE query database for the specified value:\n"
" 'name' name of device node\n"
" 'symlink' pointing to node\n"
" 'mode' permissions of node\n"
" 'owner' of node\n"
" 'group' of node\n"
" 'path' sysfs device path\n"
" -p PATH sysfs device path used for query or chain\n"
" -n NAME node name used for query\n"
"\n"
" -r print udev root\n"
" -a print all SYSFS_attributes along the device chain\n"
" -d dump whole database\n"
" -V print udev version\n"
" -h print this help text\n"
"\n");
return retval;
}
int main(int argc, char *argv[], char *envp[])
{
int retval;
main_argv = argv;
main_argc = argc;
init_logging("udevinfo");
/* initialize our configuration */
udev_init_config();
retval = process_options();
if (retval != 0)
exit(1);
exit(0);
}
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